function roll(imgname, imgtag) {
  document.images[imgtag].src = 'images/' + imgname;
}

function preload() {
  if (!document.images) return;
  var ar = new Array();
  var arguments = preload.arguments;
  for (var i = 0; i < arguments.length; i++) {
    ar[i] = new Image();
    ar[i].src = 'images/' + arguments[i];
  }
}

function verScroll(dir, spd) {
  loop = true;
	direction = "up";
	speed = 10;
	scrolltimer = null;
	if (document.layers) {
		var page = eval(document.contentLayer);
	} else {
		if (document.getElementById) {
	  	var page= eval("document.getElementById('contentLayer').style");
		} else {
			if (document.all) {
				var page = eval(document.all.contentLayer.style);
     	}
   	}
  }
		direction = dir;
		speed = parseInt(spd);
		var y_pos = parseInt(page.top);
		if (loop == true) {
			if (direction == "dn") {
				page.top = (y_pos - (speed));
			} else {
				if (direction == "up" && y_pos < 10) {
					page.top = (y_pos + (speed));
				} else {
					if (direction == "top") {
						page.top = 10;
					}
   			}
			}
			scrolltimer = setTimeout("verScroll(direction,speed)", 1);
   	}
	}
	
function stopScroll() {
  loop = false;
  clearTimeout(scrolltimer);
}