function init(){
	if(document.getElementById('contentBottom')){
		var span = document.getElementById('contentBottom');
		var h = window.innerHeight || document.documentElement.clientHeight;
		if(span.offsetTop > h){
			if(document.getElementById('topLinkFrame')){
				document.getElementById('topLinkFrame').innerHTML = document.getElementById('topLinkFrame').innerHTML+'<a href="#top" id="topLink" style="float:right;margin-right:10px;background:url(pix/btn_link_top.gif) left 4px no-repeat;">nach oben</a>';
			}else{
				span.innerHTML = '<a href="#top">nach oben</a>';
			}
		}
	}else{
		setTimeout('init()',200);
	}
}


init();