function rolling(bildname,pfad){
	if(document.layers){
		document.layers['content'].document.images[bildname].src = pfad;
	}
	if(document.all){
		document.all['content'].document.images[bildname].src = pfad;
	}
	if(document.getElementById){
		document.getElementsByTagName('img')[bildname].src = pfad;
	}
}