function switcher() {
		if (! document.getElementById || ! document.createElement) return;
		var num;
		num = Math.floor(Math.random()*(4)) + 1;
		switcher = document.getElementById('content');
		maincont = document.getElementById('main-content');
		data = maincont.innerHTML;
		newdiv = document.createElement('div');
		newdiv.id = "main-content";
		newdiv.style.background = "url(http://cee.nd.edu/css/images/graphic_main_" + num + ".jpg) no-repeat top left";
		newdiv.innerHTML = data;
		maincont.parentNode.insertBefore(newdiv,maincont);
		maincont.parentNode.removeChild(maincont);
}

if(document.documentElement){
		document.documentElement.className = "hasjs";
	};

window.onload = function() {
		switcher();
}