var px = 10;//mehr=schneller
var timer;
d_container=document.getElementById('content')
function scrollDenDiv(val){
	clearTimeout(timer);
	
	y=d_container.scrollTop;
	if(val==1)y-=px;
	if(val==2)y+=px;
	if(y<=d_container.scrollHeight-d_container.offsetHeight+px&&y>=0-px){
		d_container.scrollTop=y;
		timer=setTimeout('scrollDenDiv('+val+')',50);
	}
	if(y<0||y>d_container.scrollHeight-d_container.offsetHeight){
		clearTimeout(timer);
	}
}
$("#content").mousewheel(function(objEvent, intDelta){
	y=d_container.scrollTop;
	if (intDelta > 0){
		y-=px;
	}else if (intDelta < 0){
		y+=px;
	}
	if(y<=d_container.scrollHeight-d_container.offsetHeight+px&&y>=0-px){
		d_container.scrollTop=y;
	}
});
function mit_scrollbar(){
	if (d_container.scrollHeight>d_container.offsetHeight){
		document.getElementById('scroll_up').style.visibility="visible";
		document.getElementById('scroll_down').style.visibility="visible";
	}else{
		document.getElementById('scroll_up').style.visibility="hidden";
		document.getElementById('scroll_down').style.visibility="hidden";
	}
}