function disable_element( inputid, checkbx )
{
       var textfld = document.getElementById(inputid);

       if (checkbx.checked)
                textfld.disabled = false;
       if (!checkbx.checked)
                textfld.disabled = true;
}

function add_focus( inputid )
{
     var textfld = document.getElementById(inputid);

     if ( !textfld.disabled )
     {
           document.getElementById( inputid ).focus();
     }
}

function empty_field( field, standaard )
{
      var inhoud = document.getElementById( field );


      if ( inhoud.value == standaard )
      {
             inhoud.value = "";
      }

}

function checkCadeauWijzerVelden()
{
      if ( document.getElementById( 'cat' ).value == '0' )
      {
           alert( 'U dient een categorie te selecteren voor u kunt zoeken' );

           return false;
      }
      else if ( document.getElementById( 'budget' ).value == '0' )
      {
           alert( 'U dient een budget te selecteren voordat u kunt zoeken' );

           return false;
      }
      else
           return true;
}

function fill_field( field, input)
{
      var veld = document.getElementById( field );

      if ( veld.value == "" )
          veld.value = input;
}

function update_prijs( we )
{
     getal=5.775993992
getal=Math.round(getal*10)/10;

alert(getal);
}

function bevestig( bericht)
{



    if (bericht == '' || typeof(window.opera) != 'undefined')
    {
        return true;
    }

    return confirm(bericht);
}

function b_alert( plaatje, titel, prijs )
{
  alertwidth = 400;


  screenwidth = window.screen.availWidth;
  screenheight = window.screen.availHeight;

  screenwidth = (screenwidth/2);
  screenheight = (screenheight/2)-50;

  x_start = (screenwidth-(alertwidth/2));
  y_start = (screenheight-200);

  document.getElementById('b_alert').style.width = alertwidth;
  document.getElementById('b_alert').style.top = y_start;
  document.getElementById('b_alert').style.left = x_start;

  document.getElementById('b_alert_text').innerHTML = '<table width="100%"><td width="30%"><img src="' + plaatje + '" alt="" border=0></td><td width="70%" bgcolor="#f6f6f6" valign="top"><b> ' + titel + ' </b><p> <span class="prijs">&euro; ' + prijs + '</span></td><tr><td colspan="2" bgcolor="#EAEAEA"></td></table>';
}

 function hide_b_alert()
 {
  document.getElementById('b_alert').style.width = 0;
  document.getElementById('b_alert').style.top = -5000;
  document.getElementById('b_alert').style.left = -5000;
  document.getElementById('b_alert_text').innerHTML = "";
 }


 function verander_class( id, naar )
 {
       document.getElementById( id ).className = naar;
 }


 function check_clicked( id )
 {
       document.getElementById( id ).checked = true;
 }


 function changeClass( id, to)
 {
      document.getElementById(id).className = to;

 }

 function openPopup(url,AAttr)
 {
          AWindow=window.open(url,window.name+"X",AAttr);

          if(parseInt(navigator.appVersion)>=3)
               AWindow.focus();

          return ;
}

function changephoto(targ, orig, small, id)
{
	// Change thumbnail and slideshow order
	var layer = document.getElementById(targ);
	var zoomorig = orig;
	var zoomsmall = small;
	var e = layer.getElementsByTagName('a');
	for(var i=0; i < e.length; i++){
		if(e.item(i).id == "slidephoto1"){
			var origcounter = i;
			var oldtarget = e.item(i).href;
		}
		else if(e.item(i).href == orig){
			var hiddencounter = i;
			var hiddentarget = e.item(i).href;
		}
	}
	var l = layer.getElementsByTagName('img');
	var origsrc = l.item(origcounter).src;
	
	var ha = layer.getElementsByTagName('a');
	ha.item(hiddencounter).href = oldtarget;
	var hi = layer.getElementsByTagName('img');
	hi.item(hiddencounter).src = origsrc;
	
	var la = layer.getElementsByTagName('a');
	la.item(origcounter).href = orig;
	var li = layer.getElementsByTagName('img');
	li.item(origcounter).src = small;
	
	// Change slideshow order for zoomin link
	layer = document.getElementById('zoomin');
	var z = layer.getElementsByTagName('a');
	for(var i=0; i < z.length; i++){
		if(z.item(i).id == "zoomphoto1"){
			origcounter = i;
			oldtarget = z.item(i).href;
		} else if(z.item(i).href == zoomorig){
			hiddencounter = i;
			hiddentarget = z.item(i).href;
		}
	}
	
	var ha = layer.getElementsByTagName('a');
	ha.item(hiddencounter).href = oldtarget;
	ha.item(hiddencounter).outertext = oldtarget;
	
	var la = layer.getElementsByTagName('a');
	la.item(origcounter).href = zoomorig;
}