function smartOver(){
	setRollover('header');
	setRollover('mail');
}

function setRollover(idName) {
	if(document.getElementsByTagName) {
		if(document.getElementById(idName)){
			var images = document.getElementById(idName).getElementsByTagName("img");
			for(var i=0; i < images.length; i++) {
				if(images[i].getAttribute("src").match(/_off\./)) {
					fileName = new Array(images[i].getAttribute("src").replace("_off.", "_on."));
					preImages = new Array();
					for (j=0; j<fileName.length; j++) {
						preImages[j] = new Image();
						preImages[j].src = fileName[j];
					}
					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", smartOver, false);
}
else if(window.attachEvent) {
	window.attachEvent("onload", smartOver);
}
else{
	window.onload = smartOver;
}