function smartRollover() {
	if(document.getElementsByTagName) {
		var images = document.getElementsByTagName("img");

		for(var i=0; i < images.length; i++) {
			if(images[i].getAttribute("src").match("_off."))
			{
				images[i].onmouseover = function() {
					this.setAttribute("src", this.getAttribute("src").replace("_off.", "_on."));
				}
				images[i].onmouseout = function() {
					this.setAttribute("src", this.getAttribute("src").replace("_on.", "_off."));
				}
			}
		}
	}
}

if(window.addEventListener) {
	window.addEventListener("load", smartRollover, false);
}
else if(window.attachEvent) {
	window.attachEvent("onload", smartRollover);
}

var pic = new Array();
function loadNetwork() {
	pic[0] = new Image();
	pic[1] = new Image();
	pic[2] = new Image();
	pic[3] = new Image();

	pic[0].src = "http://rc-zienokai.net/images/home/network-map.png";
	pic[1].src = "http://rc-zienokai.net/images/home/cat-1.png";
	pic[2].src = "http://rc-zienokai.net/images/home/cat-2.png";
	pic[3].src = "http://rc-zienokai.net/images/home/cat-3.png";
}
function setNetwork(index){
	document.network_map.src = pic[index].src;
}