function setClass(elem_id, class_name, wtd) {
	if (elem = document.getElementById(elem_id)) {
		
		//wtd = what to do :)
		
		if(wtd == "s"){
			if(elem.className != ""){
				elem.className = elem.className + " " +  class_name;
			}
			else {
				elem.className = class_name;
			}
		}
		else {
            if(elem.className.length > class_name.length) {
                elem.className = elem.className.substring(0, ((elem.className.length - class_name.length) - 1));
            }
            else {
                elem.className = elem.className.substring(0, (elem.className.length - class_name.length));
            }
		}
		
	}
}

function setHover(elem1_id, elem2_id, elem3_id) {
	setClass(elem1_id, "hover", "s");
	setClass(elem2_id, "hover", "s");
	setClass(elem3_id, "hover", "s");
}

function unsetHover(elem1_id, elem2_id, elem3_id) {
	setClass(elem1_id, "hover", "us");
	setClass(elem2_id, "hover", "us");
	setClass(elem3_id, "hover", "us");
}