function sfHover(container, tags) {
	var sfEls = document.getElementById(container).getElementsByTagName(tags);
	for (var i = 0 ; i < sfEls.length ; i++) {
		sfEls[i].onmouseover = function() {
			this.className += " hover";
		}

		sfEls[i].onmouseout = function() {
			this.className = this.className.replace(new RegExp(" ?\\bhover\\b") , "");
		}
	}
}