function searchV(field,text) {
    if (field.value == text) {
        field.value = '';
    }
}
function searchN(field,text) {
    if (field.value == '') {
        field.value = text;
    }
}

function preloadImages(url,pictures){    
    if (document.images) {        
        preload_image_object = new Image();
        image_url = new Array();
        image_url = pictures.split(",");
        
        var i = 0;
        for(i=0; i<=image_url.length-1; i++){
            preload_image_object.src = url+image_url[i];
        }
    }
} 

function changeClassO(style){
    style.className=style.className+'O';
}
function changeClass(style){
    style.className=style.className.substring(0,style.className.length-1);
}

function changeImageOver(image,over){
	var ext=image.src.substring(image.src.length-4,image.src.length);
	var file=image.src.substring(0,image.src.length-4);
	image.src=file+over+ext;
}

function changeImage(image,over){
	var over_size=over.length;
	var ext=image.src.substring(image.src.length-4,image.src.length);
	var file=image.src.substring(0,image.src.length-(over_size+4));
	image.src=file+ext;
}

var prev_ul_id;
function doSubmenu(ul_id){
	if(prev_ul_id){
		document.getElementById(prev_ul_id).style.display='none';
		document.getElementById(prev_ul_id).parentNode.className='mainlevel';
	}
	document.getElementById(ul_id).style.display='block';
	document.getElementById(ul_id).parentNode.className='sublevel';
	prev_ul_id=ul_id;
}

if (document.images)
{
  pic1= new Image(259,259); 
  pic1.src="images/homepage-box-image-1.gif"; 

  pic2= new Image(259,259); 
  pic2.src="images/homepage-box-image-2.gif"; 
  
  pic3= new Image(259,259); 
  pic3.src="images/homepage-box-image-3.gif"; 
  
  pic4= new Image(259,259); 
  pic4.src="images/homepage-box-image-4.gif"; 
}

function displayCircle(image,pic){
	document.getElementById(image).src=pic.src;
}
function hideCircle(image){
	document.getElementById(image).src="images/homepage-box-image.gif";
}

// display or hide divs on events and press releases pages
var aktDiv1 = "";
var aktDiv2 = "";
function hideDiv(mainDiv,subDiv) {
   if (aktDiv1 != "" && aktDiv2 != "") {
        document.getElementById(aktDiv1).style.display='block';
        document.getElementById(aktDiv2).style.display='none';
   }
        document.getElementById(mainDiv).style.display='none';
        document.getElementById(subDiv).style.display='block';
        aktDiv1 = mainDiv;
        aktDiv2 = subDiv;
}