function opacity(theId, op, op2){
	if (document.getElementById(theId)) {
		var oe = document.getElementById(theId);
		// Set transparency to 50%
		oe.setAttribute("style", "opacity:"+op+";")
		if (oe.style.setAttribute) //For IE
			oe.style.setAttribute("filter", "alpha(opacity="+op2+");")
	}
}

opacity("rea_detail1", 0, 0);
opacity("rea_detail2", 0, 0);
opacity("rea_detail3", 0, 0);
opacity("rea_detail4", 0, 0);

opacity("overItem", 0.8, 80);
opacity("overItem2", 0.8, 80);
opacity("overItem3", 0.8, 80);
opacity("overItem4", 0.8, 80);