function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function() {
			oldonload();
			func();
		}
	}
}

function selectPicBasic() {
	if (document.getElementById("header")) {
		var randomNum = Math.floor(Math.random() * 3)+1;
		var bannerclass = "banner" + randomNum;
		var pageheader = document.getElementById("header");
		pageheader.className = bannerclass;
	}
}
addLoadEvent(selectPicBasic);


function setWelcome() {
	if (document.getElementById("welcome")) {
		document.getElementById('welcome').className = "active";
	}
}
addLoadEvent(setWelcome);