var px = 10;//mehr=schneller
var timer;
function scrollDenDiv(val){
	clearTimeout(timer);
	//d=document.getElementById('main-content')
	var y = parseInt($('#main-content').css('margin-top'));
	//if(val==1)y-=px;
	//if(val==2)y+=px;
	y -= px;
	
	$('#main-content').css('margin-top', y+"px");
	timer=setTimeout('scrollDenDiv('+val+')',30);
	
/*	if(y<0||y>d.scrollHeight-d.offsetHeight){
		clearTimeout(timer);
	}*/
}