var sens="";
var time=null;
var speed=2
var IE = document.all?true:false
var current_element_id=0
// If NS -- that is, !IE -- then set up for mouse capture
if (!IE) {
	document.captureEvents(Event.MOUSEMOVE);
}

function getMouseY() {
	obj=document.getElementById(current_element_id);
	if (sens=="up") {
		obj.scrollTop -= speed;
	}
	if (sens=="down") {
		obj.scrollTop += speed;
	}
}

function scrollVertical(element_id,commande,value) {
    current_element_id=element_id;
	if (commande=="start") {
		sens=value;
        speed=2
		time=setInterval("getMouseY()",1);
	} else {
		sens="";
		clearInterval(time);
	}	
}