var DownStep = 10;
var UpStep = -10;
var blank;
var blank2;

function StartUpScroll(ifr) {
	blank2 = setInterval("StartUpScroll2(" + ifr + ")",10);
}

function StartUpScroll2(ifr) {
	ifr.scrollBy(0, UpStep);
}

function StopUpScroll() {
	clearInterval(blank2);
}

function StartDownScroll(ifr) {
	blank = setInterval("StartDownScroll2(" + ifr + ")",10);
}

function StartDownScroll2(ifr) {
	ifr.scrollBy(0, DownStep);
}

function StopDownScroll() {
	clearInterval(blank);
}