function show_hide(id) {
        var element = document.getElementById(id);
        if (element.style.display == 'block') {
            element.style.display = 'none';
        }
        else {
            element.style.display = 'block';
        }
    }
    
    function clear_input(id, def) {
        var element = document.getElementById(id);
        if (element && element.value == def) {
            element.value = '';
        }
    }

	sfHover = function() {
	var sfEls = document.getElementById("menu").getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}

if (window.attachEvent) window.attachEvent("onload", sfHover);