window.onload = init;

function rotator(){
	var num = (Math.floor(Math.random()*5+1));
	document.getElementById("rotator").style.backgroundImage="url(/graphics/home-photo-" + num + ".jpg)";
};

function init() {
	if (document.getElementById("homePage")) {
		rotator();
		document.getElementById("e").onfocus = function() {
			this.value = "";
		}
	}
}
<!-- ph=1 -->