function setHeaderBG(obj){
	obj.style.opacity = "0.1";
	obj.style.filter = "alpha(opacity=10)";
	obj.style.visibility = "visible";
}

var obj1 = document.getElementById("welcome_bg");
var obj2 = document.getElementById("header_bg");
if(obj1)
	setHeaderBG(obj1);
if(obj2)
	setHeaderBG(obj2);