var aIds = Array( 'pg_3f4f3284fc' );
function ChangePage( to_hide, to_show )
{
   var tbl_hide = document.getElementById( aIds[to_hide] );
   var tbl_show = document.getElementById( aIds[to_show] );

   if ( typeof(tbl_hide)=='object' && tbl_hide!=null )
    if ( typeof(tbl_show)=='object' && tbl_show!=null )
    {
       tbl_hide.style.display = 'none';
       tbl_show.style.display = '';
    }
}
function NotEmpty( old_res, id, field_title )
{
   if ( old_res==0 )
   {
      var el = document.getElementById( id );
      if ( typeof(el)=='object' && el!=null )
        if ( el.value=='' )
        {
           alert( 'You need to fill in "' + field_title + '"' );
           return 1;
        }
   }
   return 0;
}
function Email( old_res, id, field_title )
{ // test
   if ( old_res==0 )
   {
      var el = document.getElementById( id );
      if ( typeof(el)=='object' && el!=null )
      {
         var re = /^[a-zA-Z0-9_\.\-]+@([a-zA-Z0-9][a-zA-Z0-9-]+\.)+[a-zA-Z]{2,4}$/;

         if (el.value.search(re) != -1 )  return 0;
         else
         {
            alert( '"'+field_title+'" must be an email address' );
            return 1;
         }
      }
   }
   return 0;
}

function CheckLeapYear( id )
{
   var aDaysNum = Array( 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 );
   var id_cut   = id.substr( 6, id.length-6 );
   var day_sel   = document.getElementById( 'fld_d_' + id_cut );
   var month_sel = document.getElementById( 'fld_m_' + id_cut );
   var year_sel  = document.getElementById( 'fld_y_' + id_cut );

   if ( typeof(day_sel)=='object' && day_sel!=null )
    if ( typeof(month_sel)=='object' && month_sel!=null )
     if ( typeof(year_sel)=='object' && year_sel!=null )
     {
        if ( month_sel.selectedIndex==1 )
        {
          if ( year_sel.value % 400==0 || (year_sel.value % 100!=0 && year_sel.value % 4==0) ) aDaysNum[1] = 29;
        }
        var day_sel_ix = day_sel.selectedIndex;
        day_sel.options.length = 0;

        for ( i=1; i<=aDaysNum[month_sel.selectedIndex]; i++ )
        {
           if ( document.createElement )
           {
              var newOpt = document.createElement( "OPTION" );
              newOpt.text = i;
              newOpt.value = i;
              ( day_sel.options.add ) ? day_sel.options.add(newOpt) : day_sel.add(newOpt, null);
           }
           else
           {
              day_sel.options[i-1] = new Option( i, i, false, false );
           }
        }
        if ( day_sel.options.length < (day_sel_ix+1) )
           day_sel.selectedIndex = day_sel.options.length-1;
        else day_sel.selectedIndex = day_sel_ix;
     }
}