function leadZero( xNumber ) {
       if( xNumber.length < 2 ) { xNumber = '0' + xNumber }
       return xNumber;
    }
    
    function checkYear(year) { 
       return (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) ? 1 : 0;
    }
    
    function checkDate( myDate ) {
       var months = new Array( );
       months[ 0 ] = 31; months[ 1 ] = 28;  months[ 2 ] = 31;  months[ 3 ] = 30;
       months[ 4 ] = 31; months[ 5 ] = 30;  months[ 6 ] = 31;  months[ 7 ] = 31;
       months[ 8 ] = 30; months[ 9 ] = 31; months[ 10 ] = 30; months[ 11 ] = 31;

       x1 = 0;
       y = '';
       z = '';

       if ( myDate.length != 0 )  {
          x = myDate.indexOf( '/' );
          if ( x < 0 ) { x = myDate.indexOf( '-' ) }
          if ( x < 0  && myDate.length == 8 ) {
             xDate = myDate.substring( 0, 4 ) + '/' + myDate.substring( 4, 6 ) + '/' + myDate.substring( 6, 8 );  
             myDate = xDate;
             x = myDate.indexOf( '/' );
       }
       if ( x == 4 ) { 
          y = myDate.substring( 0, x );
          yNumber = parseInt( y, 10 );
          if( !isNaN( yNumber ) && yNumber > 1900  ) {
            z =  yNumber.toString() + '/';
            if ( checkYear( yNumber ) ) { months[ 1 ] = 29; }
            x1 = myDate.indexOf( '/', x + 1 )
            if ( x1 < 0 ) { x1 = myDate.indexOf( '-', x + 1 ) }
            if ( x1 >= (x + 2) && x1 <= (x + 3) ) {
               y = myDate.substring( x+1, x1 );
               yNumber = parseInt( y, 10 );
               if( !isNaN( yNumber ) && yNumber <= 12 && yNumber >= 1 ) {
                  z = z + leadZero( yNumber.toString() ) + '/';
                  y = myDate.substring( x1+1, myDate.length );
                  yNumber = parseInt( y, 10 );
                  if( !isNaN( yNumber ) && yNumber <= months[ parseInt( z.substring( 5, 7 ), 10 ) - 1 ] && yNumber >= 1 ) {
                     z = z + leadZero( yNumber.toString() );
                  } 
               }
            }
          }
       }
       if ( z.length < 10 ) { z = ''; }
      }
       return z;
    }

    var cValidChars     = "abcdefghijklmnñopqrstuvwxyzáéíóú ";
    var cValidData      = "abcdefghijklmnñopqrstuvwxyzáéíóú 0123456789#/,*.";
    var cValidDataCCT   = 'abcdefghijklmnñopqrstuvwxyzáéíóú 0123456789#/,*."';
    var cValidLTGTitulo = 'abcdefghijklmnñopqrstuvwxyzáéíóú 0123456789#/,*."-';
    var cValidLTGClave  = 'abcdefghijklmnñopqrstuvwxyz0123456789-';
    var cValidRFC       = "abcdefghijklmnñopqrstuvwxyz0123456789";
    var cValidCharNumber = "abcdefghijklmnñopqrstuvwxyzáéíóú 0123456789";
    var cValidNumbers   = "0123456789";
    var cValidARC       = "earc0123456789";
    var cValidNames     = "abcdefghijklmnñopqrstuvwxyzü "
    var cValidGrades    = "0123456789."
    var cValidGradesInt = "0123456789"

    function ValidText( xTexto, xSetCaracteres ) {
      var xCtrl = 0;
      var xTxt = xTexto.toLowerCase();
      var xTxtLast = xTxt.charAt( 0 );
      xTexto = '';
      while ( xCtrl < xTxt.length ) {
         if ( xSetCaracteres.indexOf( xTxt.charAt( xCtrl ) ) > -1  ) {
            xTexto = xTexto + xTxt.charAt( xCtrl );
            xTxtLast = xTxt.charAt( xCtrl );
         }
         xCtrl++;
      }
      return( xTexto );
    }

    function ValidCantidad( xCantidad ) {
       xCantidad = ValidInput( xCantidad, cValidNumbers );
       if ( xCantidad.length > 1 ) {
         while( xCantidad.charAt( 0 ) == '0' ) {
            xCantidad = xCantidad.substring( 1, xCantidad.length );
         }
       }
       if ( xCantidad.length == 0 ) { xCantidad='0'; }
       return( xCantidad );
    }

    function ValidInput( xTexto, xSetCaracteres ) {
      var xCtrl = 0;
      var xTextoAux = '';
      var xTxt = xTexto.toLowerCase();
      var xTxtLast = xTxt.charAt( 0 );
      xTexto = '';
      while ( xCtrl < xTxt.length ) {
         if ( xSetCaracteres.indexOf( xTxt.charAt( xCtrl ) ) > -1  ) {
            if ( xTxtLast.charAt( 0 ) == ' ' && xTxt.charAt( xCtrl ) == ' ' ) {
            } else {
               xTexto = xTexto + xTxt.charAt( xCtrl );
               xTxtLast = xTxt.charAt( xCtrl );
            }
         }
         xCtrl++;
      }
      while ( xTexto.charAt( 0 ) == ' ' ) {
         xTexto = xTexto.substring( 1, xTexto.length ); 
      }
      while ( xTexto.charAt( xTexto.length - 1 ) == ' ' ) {
         xTexto = xTexto.substring( 0, xTexto.length - 1 ); 
      }
      
      return( xTexto.toUpperCase() );
    }
    
    function ValidValueMinMax( xTexto, xMin, xMax ) {
      xTexto = ValidInput( xTexto, cValidNumbers );
      if ( isNaN( parseInt( xTexto ) ) )  {
         xTexto = '';
      } else {
         if ( ( parseInt( xTexto ) >= parseInt( xMin ) ) && ( parseInt( xTexto ) <= parseInt( xMax ) ) ) {
         } else {
            alert( xTexto + ' no esta entre ' + xMin + ' y ' + xMax + '\npor lo tanto no es un ciclo válido.' );
            xTexto = '';
         }    
      }   
      return ( xTexto );    
    }

    function ValueMinMax( xTexto, xMin, xMax ) {
      xTexto = ValidInput( xTexto, cValidNumbers );
      if ( isNaN( parseInt( xTexto ) ) )  {
         xTexto = '';
      } else {
         if ( ( parseInt( xTexto ) >= parseInt( xMin ) ) && ( parseInt( xTexto ) <= parseInt( xMax ) ) ) {
         } else {
            alert( xTexto + ' no esta entre ' + xMin + ' y ' + xMax );
            xTexto = xMin;
         }    
      }   
      return ( xTexto );    
    }


    function ValidGrade( xTexto ) {
      xTexto = ValidInput( xTexto, cValidGrades ) 
      while ( xTexto.charAt( 0 ) == '0' ) {
         xTexto = xTexto.substring( 1, xTexto.length ); 
      }
      while ( xTexto.charAt( xTexto.length - 1 ) == '.' ) {
         xTexto = xTexto.substring( 0, xTexto.length - 1 ); 
      }
      if ( isNaN( parseFloat( xTexto ) ) )  {
         xTexto = '0';
      } else {
         if ( ( parseFloat( xTexto ) >= 5.0 && parseFloat( xTexto ) <= 10.0 ) || ( parseFloat( xTexto ) == 0 ) ) {
            if ( parseFloat( xTexto ) < 10.0 && parseFloat( xTexto ) >= 5.0 && xTexto.length > 3 ) {
               xTexto = xTexto.substring( 0, 3 );
            }
         } else {
           if ( parseInt( xTexto ) >= 50 && parseInt( xTexto ) <= 100 ) { 
              if ( parseInt( xTexto ) == 100 ) { xTexto = '10'; } else { xTexto = xTexto.charAt( 0 ) + '.' + xTexto.charAt( 1 ); }
           } else {
              alert( 'La calificación debe ser mayor o igual a 5.0 y menor o igual a 10.0' ); 
              xTexto = '0';
           }
         }
      }
      return( xTexto )
    }

    function ValidGradeOBJ( xObjeto ) {
      xResultado = true;
      xTexto = ValidInput( xObjeto.value, cValidGrades ) 
      while ( xTexto.charAt( 0 ) == '0' ) {
         xTexto = xTexto.substring( 1, xTexto.length ); 
      }
      while ( xTexto.charAt( xTexto.length - 1 ) == '.' ) {
         xTexto = xTexto.substring( 0, xTexto.length - 1 ); 
      }
      if ( isNaN( parseFloat( xTexto ) ) )  {
         xTexto = '0';
      } else {
         if ( ( parseFloat( xTexto ) >= 5.0 && parseFloat( xTexto ) <= 10.0 ) || ( parseFloat( xTexto ) == 0 ) ) {
            if ( parseFloat( xTexto ) < 10.0 && parseFloat( xTexto ) >= 5.0 && xTexto.length > 3 ) {
               xTexto = xTexto.substring( 0, 3 );
            }
         } else {
           if ( parseInt( xTexto ) >= 50 && parseInt( xTexto ) <= 100 ) { 
              if ( parseInt( xTexto ) == 100 ) { xTexto = '10'; } else { xTexto = xTexto.charAt( 0 ) + '.' + xTexto.charAt( 1 ); }
           } else {
              alert( 'La calificación debe ser mayor o igual a 5.0 y menor o igual a 10.0' ); 
              xTexto = '0';
              xResultado = false;
           }
         }
      }
      if ( parseFloat( xTexto ) >= 5.0 && parseFloat( xTexto ) < 6.0 ) {
         xObjeto.style.background = '#ff0000';
         xObjeto.style.color = '#FFFFFF';
      } else {
         if ( parseFloat( xTexto ) >= 6.0 ) {
              xObjeto.style.background = '#ffffff';
              xObjeto.style.color = '#000000';
         } else {
              xObjeto.style.background = '#F9FABB';
              xObjeto.style.color = '#000000';
         }
      }
      xObjeto.value = xTexto;
      if ( xResultado ) { return( true ); } 
      else {
           xObjeto.focus();
           xObjeto.select();
      }
    }

    function ValidGradeOBJint( xObjeto ) {
      xResultado = true;
      xTexto = ValidInput( xObjeto.value, cValidGradesInt ) 
      while ( xTexto.charAt( 0 ) == '0' ) {
         xTexto = xTexto.substring( 1, xTexto.length ); 
      }
      while ( xTexto.charAt( xTexto.length - 1 ) == '.' ) {
         xTexto = xTexto.substring( 0, xTexto.length - 1 ); 
      }
      if ( isNaN( parseInt( xTexto ) ) )  {
         xTexto = '0';
      } else {
         if ( ( parseInt( xTexto ) >= 5 && parseInt( xTexto ) <= 10 ) || ( parseInt( xTexto ) == 0 ) ) {
            if ( parseInt( xTexto ) < 10 && parseInt( xTexto ) >= 5 && xTexto.length > 2 ) {
               xTexto = xTexto.substring( 0, 2 );
            }
         } else {
           alert( 'La calificación debe ser mayor o igual a 5 y menor o igual a 10' ); 
           xTexto = '0';
           xResultado = false;
         }
      }
      if ( parseInt( xTexto ) >= 5 && parseInt( xTexto ) < 6 ) {
         xObjeto.style.background = '#ff0000';
         xObjeto.style.color = '#FFFFFF';
      } else {
         if ( parseInt( xTexto ) >= 6 ) {
              xObjeto.style.background = '#ffffff';
              xObjeto.style.color = '#000000';
         } else {
              xObjeto.style.background = '#F9FABB';
              xObjeto.style.color = '#000000';
         }
      }
      xObjeto.value = xTexto;
      if ( xResultado ) { return( true ); } 
      else {
           xObjeto.focus();
           xObjeto.select();
      }
    }

    function ValidTextAccents( xTexto, xSetCaracteres ) {
      var xCtrl = 0;
      var xTxt = xTexto.toLowerCase();
      xTxt = xTxt.replace("á","a");
      xTxt = xTxt.replace("é","e");
      xTxt = xTxt.replace("í","i");
      xTxt = xTxt.replace("ó","o");
      xTxt = xTxt.replace("ú","u");
      var xTxtLast = xTxt.charAt( 0 );
      xTexto = '';
      while ( xCtrl < xTxt.length ) {
         if ( xSetCaracteres.indexOf( xTxt.charAt( xCtrl ) ) > -1  ) {
            xTexto = xTexto + xTxt.charAt( xCtrl );
            xTxtLast = xTxt.charAt( xCtrl );
         }
         xCtrl++;
      }
      return( xTexto );
    }


    function checkDateLimited( myDate, minDate, maxDate ) {
       var months = new Array( );
       months[ 0 ] = 31; months[ 1 ] = 28;  months[ 2 ] = 31;  months[ 3 ] = 30;
       months[ 4 ] = 31; months[ 5 ] = 30;  months[ 6 ] = 31;  months[ 7 ] = 31;
       months[ 8 ] = 30; months[ 9 ] = 31; months[ 10 ] = 30; months[ 11 ] = 31;

       x1 = 0;
       y = '';
       z = '';


      if ( myDate.length != 0 )  {
       x = myDate.indexOf( '/' );
       if ( x < 0 ) { x = myDate.indexOf( '-' ) }
       if ( x < 0  && myDate.length == 8 ) {
          xDate = myDate.substring( 0, 4 ) + '/' + myDate.substring( 4, 6 ) + '/' + myDate.substring( 6, 8 );  
          myDate = xDate;
          x = myDate.indexOf( '/' );
       }
       if ( x == 4 ) { 
          y = myDate.substring( 0, x );
          yNumber = parseInt( y, 10 );
          if( !isNaN( yNumber ) && yNumber > 1900  ) {
            z =  yNumber.toString() + '/';
            if ( checkYear( yNumber ) ) { months[ 1 ] = 29; }
            x1 = myDate.indexOf( '/', x + 1 )
            if ( x1 < 0 ) { x1 = myDate.indexOf( '-', x + 1 ) }
            if ( x1 >= (x + 2) && x1 <= (x + 3) ) {
               y = myDate.substring( x+1, x1 );
               yNumber = parseInt( y, 10 );
               if( !isNaN( yNumber ) && yNumber <= 12 && yNumber >= 1 ) {
                  z = z + leadZero( yNumber.toString() ) + '/';
                  y = myDate.substring( x1+1, myDate.length );
                  yNumber = parseInt( y, 10 );
                  if( !isNaN( yNumber ) && yNumber <= months[ parseInt( z.substring( 5, 7 ), 10 ) - 1 ] && yNumber >= 1 ) {
                     z = z + leadZero( yNumber.toString() );
                  } 
               }
            }
          }
       }
       if ( z.length < 10 ) { z = ''; }
       if ( z.length == 10 ) {
          if( z >= minDate && z<=maxDate ) {
          } else {
            alert( 'Según la normatividad, para inscribir a un niño en el grado seleccionado\nla fecha de nacimiento debe ser entre ' + minDate + ' y ' + maxDate );
            z = '';
          }
       } else { alert('La Fecha proporcionada no es valida.') }
      }
       return z;
    }


    function txtRelated( xSource, xTarget ) {
       xTarget.value = xSource.value; 
    }

    function selRelated( xSource, xTarget ) {
       if ( xTarget.value != xSource.value ) {
          xCtrl = -1;
          while ( ++xCtrl < xTarget.length ) {
             if ( xTarget[ xCtrl ].value == xSource.value ) {
                xTarget[ xCtrl ].selected = true;
                xTarget.value = xSource.value;
                xCtrl = xTarget.length;
             }
          }
          if ( xTarget.value != xSource.value ) { xSource.value = xTarget.value } 
       }
    }

    function selRelatedExtended( xSource, xTarget, xRelated, xRelatedMsg, curMsg ) {
       if ( xTarget.value != xSource.value ) {
          xCtrl = -1;
          while ( ++xCtrl < xTarget.length ) {
             if ( xTarget[ xCtrl ].value == xSource.value ) {
                xTarget[ xCtrl ].selected = true;
                xTarget.value = xSource.value;
                xCtrl = xTarget.length;
             }
          }
          if ( xTarget.value != xSource.value ) { xSource.value = xTarget.value }  else {
             xRelated.value = 0; 
             xRelatedMsg.value = curMsg;
          }
       }
    }
    
    function valRelMinMax( xSelf, xOther, xMin, xMax ) {
       xSelf.value = ValidInput( xSelf.value, cValidNumbers );  
       if ( xSelf.value.length == 0 ) { 
          xSelf.value = xMin;
          xOther.value = xMax;
       } else {
          if ( (parseInt( xSelf.value ) >= xMin) && (parseInt( xSelf.value ) <= xMax) ) {
             if ( xOther.value.length == 0 ) {
                xOther.value = xSelf.value
             } else {
                if ( parseInt( xOther.value ) < parseInt( xSelf.value ) ) {
                   xOther.value = xSelf.value
                }
             }
          } else {
             if ( parseInt( xSelf.value ) > xMin ) {
                xSelf.value = xMax;
                xOther.value = xMax;
             } else {
                xSelf.value = xMin;
             }
          }
       }   
    }
 
    function valRelMaxMin( xSelf, xOther, xMin, xMax ) {
       xSelf.value = ValidInput( xSelf.value, cValidNumbers );  
       if ( xSelf.value.length == 0 ) { 
          xSelf.value = xMax;
          xOther.value = xMin;
       } else {
          if ( (parseInt( xSelf.value ) >= xMin) && (parseInt( xSelf.value ) <= xMax) ) {
             if ( xOther.value.length == 0 ) {
                xOther.value = xSelf.value
             } else {
                if ( parseInt( xOther.value ) > parseInt( xSelf.value ) ) {
                   xOther.value = xSelf.value
                }
             }
          } else {
             if ( parseInt( xSelf.value ) > xMax ) {
                xSelf.value = xMax;
                xOther.value = xMin;
             } else {
                xSelf.value = xMax;
             }
          }
       }   
    }

  function getRadioValNoForm( name) {
      var val;
      var radios = document.getElementsByName(name);
      for (var i=0, len=radios.length; i<len; i++) {
          if ( radios[i].checked ) { 
              val = radios[i].value; 
              break; // 
          }
      }
      return val; 
  }

  function setRadioValNoForm( name, currentValue) {
      var val;
      var radios = document.getElementsByName(name);
      for (var i=0, len=radios.length; i<len; i++) {
          if ( radios[i].value == currentValue ) { 
              radios[i].checked = true;
              break; // 
          }
      }
      return true; 
  }