var isOpera,isIE=false;
if(typeof(window.opera)!='undefined') isOpera=true;
if(!isOpera&&navigator.userAgent.indexOf('Internet Explorer')) isIE=true;

if(isIE) {
	document.getElementsByName=function(name){
		var tmp=document.getElementsByTagName('*'),matches=[];
		for(var i=0;i<tmp.length;i++){
			if(tmp[i].name==name) matches.push(tmp[i]);
		}
		return matches; }
}

var pics=new Array(
'images/nav_top_downloads.gif','images/nav_top_downloads_h.gif',
'images/nav_top_impressum.gif','images/nav_top_impressum_h.gif',
'images/nav_top_kontakt.gif','images/nav_top_kontakt_h.gif',
'images/nav_top_profil.gif','images/nav_top_profil_h.gif',
'images/nav_top_termine.gif','images/nav_top_termine_h.gif',
'images/nav_top_veroeff.gif','images/nav_top_veroeff_h.gif');
for(i=0;i<pics.length;i++){preload(pics[i]);}

function turnon(e) {
	var el=document.getElementsByName(e+'_off')[0];
	if(el==null) return;
	el.src='images/nav_top_'+e+'_h.gif';
	el.name=e+'_on';
}

function turnoff(e) {
	var el=document.getElementsByName(e+'_on')[0];
	if(el==null) return;
	el.src='images/nav_top_'+e+'.gif';
	el.name=e+'_off';
}

function preload(img) {
	var e=new Image();
	e.src=img;
}