function updateDates( formname, beginField, endField, daterangechosen )
{
   
   if ( daterangechosen == '1' )
   {
      setOptionValue( getFormElement( formname, beginField + '_webformDateMonth'),'3');
      setOptionValue( getFormElement( formname, beginField + '_webformDateDay'),'14');
      setOptionValue( getFormElement( formname, beginField + '_webformDateYear'),'2010');
      setOptionValue( getFormElement( formname, endField + '_webformDateMonth'),'3');
      setOptionValue( getFormElement( formname, endField + '_webformDateDay'),'18');
      setOptionValue( getFormElement( formname, endField + '_webformDateYear'),'2010');
      return false;
   }
   
   if ( daterangechosen == '2' )
   {
      setOptionValue( getFormElement( formname, beginField + '_webformDateMonth'),'3');
      setOptionValue( getFormElement( formname, beginField + '_webformDateDay'),'7');
      setOptionValue( getFormElement( formname, beginField + '_webformDateYear'),'2010');
      setOptionValue( getFormElement( formname, endField + '_webformDateMonth'),'3');
      setOptionValue( getFormElement( formname, endField + '_webformDateDay'),'13');
      setOptionValue( getFormElement( formname, endField + '_webformDateYear'),'2010');
      return false;
   }
   
   if ( daterangechosen == '3' )
   {
      setOptionValue( getFormElement( formname, beginField + '_webformDateMonth'),'3');
      setOptionValue( getFormElement( formname, beginField + '_webformDateDay'),'1');
      setOptionValue( getFormElement( formname, beginField + '_webformDateYear'),'2010');
      setOptionValue( getFormElement( formname, endField + '_webformDateMonth'),'3');
      setOptionValue( getFormElement( formname, endField + '_webformDateDay'),'18');
      setOptionValue( getFormElement( formname, endField + '_webformDateYear'),'2010');
      return false;
   }
   
   if ( daterangechosen == '4' )
   {
      setOptionValue( getFormElement( formname, beginField + '_webformDateMonth'),'2');
      setOptionValue( getFormElement( formname, beginField + '_webformDateDay'),'1');
      setOptionValue( getFormElement( formname, beginField + '_webformDateYear'),'2010');
      setOptionValue( getFormElement( formname, endField + '_webformDateMonth'),'2');
      setOptionValue( getFormElement( formname, endField + '_webformDateDay'),'28');
      setOptionValue( getFormElement( formname, endField + '_webformDateYear'),'2010');
      return false;
   }
   
   if ( daterangechosen == '5' )
   {
      setOptionValue( getFormElement( formname, beginField + '_webformDateMonth'),'1');
      setOptionValue( getFormElement( formname, beginField + '_webformDateDay'),'1');
      setOptionValue( getFormElement( formname, beginField + '_webformDateYear'),'2010');
      setOptionValue( getFormElement( formname, endField + '_webformDateMonth'),'3');
      setOptionValue( getFormElement( formname, endField + '_webformDateDay'),'18');
      setOptionValue( getFormElement( formname, endField + '_webformDateYear'),'2010');
      return false;
   }
   
   if ( daterangechosen == '6' )
   {
      setOptionValue( getFormElement( formname, beginField + '_webformDateMonth'),'1');
      setOptionValue( getFormElement( formname, beginField + '_webformDateDay'),'1');
      setOptionValue( getFormElement( formname, beginField + '_webformDateYear'),'2009');
      setOptionValue( getFormElement( formname, endField + '_webformDateMonth'),'12');
      setOptionValue( getFormElement( formname, endField + '_webformDateDay'),'31');
      setOptionValue( getFormElement( formname, endField + '_webformDateYear'),'2009');
      return false;
   }
   
   if ( daterangechosen == '7' )
   {
      setOptionValue( getFormElement( formname, beginField + '_webformDateMonth'),'3');
      setOptionValue( getFormElement( formname, beginField + '_webformDateDay'),'18');
      setOptionValue( getFormElement( formname, beginField + '_webformDateYear'),'2010');
      setOptionValue( getFormElement( formname, endField + '_webformDateMonth'),'3');
      setOptionValue( getFormElement( formname, endField + '_webformDateDay'),'18');
      setOptionValue( getFormElement( formname, endField + '_webformDateYear'),'2010');
      return false;
   }
   
   if ( daterangechosen == '8' )
   {
      setOptionValue( getFormElement( formname, beginField + '_webformDateMonth'),'3');
      setOptionValue( getFormElement( formname, beginField + '_webformDateDay'),'17');
      setOptionValue( getFormElement( formname, beginField + '_webformDateYear'),'2010');
      setOptionValue( getFormElement( formname, endField + '_webformDateMonth'),'3');
      setOptionValue( getFormElement( formname, endField + '_webformDateDay'),'17');
      setOptionValue( getFormElement( formname, endField + '_webformDateYear'),'2010');
      return false;
   }
   
   if ( daterangechosen == '9' )
   {
      setOptionValue( getFormElement( formname, beginField + '_webformDateMonth'), '0');
      setOptionValue( getFormElement( formname, beginField + '_webformDateDay'), '0');
      setOptionValue( getFormElement( formname, beginField + '_webformDateYear'), '0');
      setOptionValue( getFormElement( formname, endField + '_webformDateMonth'), '0');
      setOptionValue( getFormElement( formname, endField + '_webformDateDay'), '0');
      setOptionValue( getFormElement( formname, endField + '_webformDateYear'), '0');
      return false;
   }
   return true;
}

function resetDateRangeDropDown( formName )
{
   getFormElement( formName, formName + '_daterange_select').options[0].selected = true;
}

function getFormElement( formname, elementname )
{
   if ( formname == '' )
   {
      for ( var y=0; y < this.document.forms[0].elements.length; y++ )
      {
         if ( this.document.forms[0].elements[y].name == elementname )
         {
            return this.document.forms[0].elements[y];
         }
      }
   }
   else
   {
      for ( var x=0; x < this.document.forms.length; x++ )
      {
         if ( this.document.forms[x].name == formname )
         {
            for ( var y=0; y < this.document.forms[x].elements.length; y++ )
            {
               if ( this.document.forms[x].elements[y].name == elementname )
               {
                  return this.document.forms[x].elements[y];
               }
            }
         }
      }
      return null;
   }
}

function setOptionValue( formelement, textValue )
{
   for ( var y=0; y < formelement.options.length; y++ )
   {
      if ( formelement.options[y].value == textValue )
      {
         formelement.options[y].selected = true;
         return true;
      }
   }
   return false
}

function resetDayDropDown( formName, fieldName )
{
   var currentMonthDex = getFormElement( formName, fieldName + '_webformDateMonth').options.selectedIndex;
   var currentYearDex = getFormElement( formName, fieldName + '_webformDateYear').options.selectedIndex;
   var month = getFormElement( formName, fieldName + '_webformDateMonth').options[currentMonthDex].value;
   var year = getFormElement( formName, fieldName + '_webformDateYear').options[currentYearDex].value;

   if ( month == '1' || month == '3' || month == '5' || month == '7' || month == '8' || month == '10' || month == '12' )
   {
      populateDayDropDown( formName, fieldName, 31 );
   }
   else if ( month == '4' || month == '6' || month == '9' || month == '11' )
   {
      populateDayDropDown( formName, fieldName, 30 );
   }
   else
   {
      // leap year calculation
      var mod = year % 4;
      if ( mod == 0 && year > 0)
      {
         mod = year % 100;
         if ( mod == 0 )
         {
            mod = year % 400;
            if ( mod == 0 )
            {
               populateDayDropDown( formName, fieldName, 29 );
            }
            else
            {
               populateDayDropDown( formName, fieldName, 28 );
            }
         }
         else
         {
            populateDayDropDown( formName, fieldName, 29 );
         }
      }
      else
      {
         populateDayDropDown( formName, fieldName, 28 );
      }
   }
}

function populateDayDropDown( formName, fieldName, end )
{
   var dayControl = getFormElement( formName, fieldName + '_webformDateDay' );
   var selectedDex = dayControl.options.selectedIndex;
   var lastValue = dayControl.options[ dayControl.length - 1 ].value;

   // difference between index and actual value
   // is different if the control starts with empty line or not
   var offSet = (dayControl.length - 1) - lastValue;

   if ( lastValue > end )
   {
      // we need to trim down
      for ( var y = dayControl.options.length - 1; y > (end + offSet); y-- )
      {
         dayControl.remove(y);
      }
   }
   else 
   {
      if ( lastValue < end )
      {
         // we need to add
         for ( var y = dayControl.options.length; y < ( end + 1 + offSet ); y++ )
         {
            dayControl.options[y] = new Option( y - offSet, y - offSet );
         }
      }
   }
   if ( selectedDex > dayControl.options.length - 1)
   {
      dayControl.options[ dayControl.length - 1 ].selected = true;
   }
}