function changeImage () {
	if ( document.getElementById("page-image") ) 
	{
		document.getElementById("page-image").className = " visual" + Math.round(Math.random() * 4 + 1);
	}
}
if (window.addEventListener) window.addEventListener("load", changeImage, false);
else if (window.attachEvent) window.attachEvent("onload", changeImage);
;