var scrolling;

var schiebe = function(dir){
  schrittweite = 5;
  obj = jQuery('#ausschnitt');
  oldpos = obj.scrollTop();
  newpos = oldpos + schrittweite*dir;
  obj.scrollTop(newpos);
  

}

function startScroll(dir){
  //scrolling = schiebe.periodical(25,this,dir);
	if(dir==1){
		scrolling = window.setInterval("schiebe(1)",25);
	}
	else if(dir==-1){
		scrolling = window.setInterval("schiebe(-1)",25);
	}
}

function stopScroll(){
  //$clear(scrolling);
	window.clearInterval(scrolling);
	scrolling = false;
}