var fps = 25;
var ms = 1000/fps;

	
function startScroll(target, speed) {		
	var elem=document.getElementById(target);
	var eHeight=parseInt(elem.offsetHeight);
	
	if(elem.stopIntervalScroll)
		window.clearInterval(elem.stopIntervalScroll);
	elem.stopIntervalScroll = window.setInterval(
		function () {
			//Move upwards, mod height thing
			if(!elem.style.marginTop)
				elem.style.marginTop=0+'px';
				
			elem.style.marginTop=-1*((Math.abs(parseInt(elem.style.marginTop))+1*speed)%eHeight)+'px';
			}
		, ms);
	}


function stopScroll(target) {		
	var elem=document.getElementById(target);
	window.clearInterval(elem.stopIntervalScroll);
	}