var activeImg;
var ext;
var newext;
var i;

// _omo.ext = over
// _act.ext = down
function getElementsByClass(searchClass,node,tag) {
	var classElements = new Array();
	if ( node == null )
		node = document;
	if ( tag == null )
		tag = '*';
	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp('(^|\\s)'+searchClass+'(\\s|$)');
	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}


function mouseGoesOver()
{
 if(this.id == 'active_menu') 
 { 
  return; 
 }
 
 i = this.src.lastIndexOf('.');
 ext = this.src.substr(i);
 this.src = this.src.replace(ext, '_omo' + ext);
}

function mouseGoesOut()
{
 if(this.id == 'active_menu') 
 {
   return; 
 }
 
 i = this.src.lastIndexOf('_');
 ext = this.src.substr(i);
 newext = ext.replace('_omo','');
 this.src = this.src.replace(ext, newext);
 setActive();
}

function setActive()
{
 activeImg = document.getElementById('active_img');
 if(activeImg)
 {
	// Wenn das Bild nicht bereits aktiv ist
	if(activeImg.src.lastIndexOf('_omo') == -1) 
	{
	 i = activeImg.src.lastIndexOf('.');
     ext = activeImg.src.substr(i);
	 activeImg.src = activeImg.src.replace(ext, '_omo' + ext);
	}
 } 
  
}
function setParentActive()
{
 activeImg = document.getElementById('active_parent');
 if(activeImg)
 {
	// Wenn das Bild nicht bereits aktiv ist
	if(activeImg.src.lastIndexOf('_act') == -1) 
	{
	 i = activeImg.src.lastIndexOf('.');
     ext = activeImg.src.substr(i);
 	 activeImg.src = activeImg.src.replace(ext, '_act' + ext);
	}
 } 
  
}

function initMouseovers()
{
	var imgs = document.getElementsByTagName('img');
	for (var i=0;i<imgs.length;i++)
	{
		if(imgs[i].getAttribute('class') == "mainlevel" || imgs[i].getAttribute('class') == "sublevel" || imgs[i].getAttribute('class') == "mainlevel_current" || imgs[i].getAttribute('class') == "mainlevel_active")
		{
		imgs[i].onmouseover = mouseGoesOver;
		imgs[i].onmouseout = mouseGoesOut;
		}
	}
}

function setSize()
{
 theframe = document.getElementById("pageFrame");
 rightcol = document.getElementById("rightColumn");

 fh = theframe.offsetHeight;
 rch = rightcol.offsetHeight;
 if(fh < (rch+160)) 
 {
  theframe.style.height = (rch+160) + "px"; 
 } 

}

window.onload = function() {
  initMouseovers();
  setActive();
  setParentActive();
}