var ie45,ns6,ns4,dom;
if (navigator.appName == "Microsoft Internet Explorer") ie45 = parseInt(navigator.appVersion) >= 4;
else if (navigator.appName == "Netscape"){
	ns6 = parseInt(navigator.appVersion) >= 5;
	ns4 = parseInt(navigator.appVersion) < 5;}
dom = ie45 || ns6;

	randImages = new Array;
	randImages[randImages.length] = "images/header_plate01.jpg";
	randImages[randImages.length] = "images/header_plate02.jpg";
	randImages[randImages.length] = "images/header_plate03.jpg";
	randImages[randImages.length] = "images/header_plate04.jpg";
	randImages[randImages.length] = "images/header_plate05.jpg";

	function selectRandImage(id) {

		el = document.all ? document.all[id] : dom ? document.getElementById(id) : document.images[id];

		num = randImages.length - 1;
		rand = Math.round(Math.random( ) * num);

		el.src = randImages[rand];
	}

function Roll_gif(id,over)
{
	if(window.document.images) 
	{
		if (over)
			window.document.images[id].src = "images/" + id + "_over.gif";
		else
			window.document.images[id].src =  "images/" + id + ".gif";
	}
}