function init(){
	newBg();
	//alert(Math.floor(6*Math.random()));

}
function newBg(bgNumber){
	var total = 8;
	var bodyTag = document.body;
	if (!bgNumber) bgNumber = Math.floor(total*Math.random());
	var newBg = " bg" + bgNumber;
	bodyTag.className = newBg + "";
}
function addEvent(obj, evType, fn){
 if (obj.addEventListener){
   obj.addEventListener(evType, fn, false);
   return true;
 } else if (obj.attachEvent){
   var r = obj.attachEvent("on"+evType, fn);
   return r;
 } else {
   return false;
 }
}

addEvent(window, 'load', init);