function popup(url, title, W, H, features){
	var X = Math.ceil((window.screen.availWidth - W) / 2);
	var Y = Math.ceil((window.screen.availHeight - H) / 2);
	features = "width=" + W + ", height=" + H + ", left=" + X + ", top=" + Y + ", " + features;
	window.open(url, title, features);
}

function cimg(name,ov){
		if (document.images[name]){
			document.images[name].src = "images/" + name + ((ov == 0)?"over":"") + ".gif";
		}
		
	}

function cimg2(name,ov){
		if (document.images[name]){
			document.images[name].src = "images/" + name + ((ov == 0)?"over":"") + ".jpg";
		}
		
	}