var ourInterval;
var scrollSpeed = 50;
var scrollHeight = 5;


function scrollStart(direction, divID){
	// REPEATED CALL EITHER scrollUp OR scrollDown
	ourInterval = setInterval("scroll"+direction+"('"+divID+"')", scrollSpeed);
}
	function scrollEnd(){
	// STOP CALLING THE SCROLL FUNCTION
	clearInterval(ourInterval);
}


function scrollUp(which){
// SET THE SCROLL TOP
document.getElementById(which).scrollTop = document.getElementById(which).scrollTop - scrollHeight;
}
function scrollDown(which){
// SET THE SCROLL TOP
document.getElementById(which).scrollTop = document.getElementById(which).scrollTop + scrollHeight;
}