sfHover = function() {
	var sfEls = document.getElementById("nav").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);


function change(id, newClass) {
	identity=document.getElementById(id);
	identity.className=newClass;
}
function showtab1() {
		change('secondmenuholder1','visible');
		change('secondmenuholder2','invisible');
		change('secondmenuholder3','invisible');
		change('secondmenuholder4','invisible');
		change('secondmenuholder5','invisible');
		change('secondmenuholder6','invisible');
		change('secondmenuholder7','invisible');
}
function showtab2() {
		change('secondmenuholder1','invisible');
		change('secondmenuholder2','visible');
		change('secondmenuholder3','invisible');
		change('secondmenuholder4','invisible');
		change('secondmenuholder5','invisible');
		change('secondmenuholder6','invisible');
		change('secondmenuholder7','invisible');
}

function showtab3() {
		change('secondmenuholder1','invisible');
		change('secondmenuholder2','invisible');
		change('secondmenuholder3','visible');
		change('secondmenuholder4','invisible');
		change('secondmenuholder5','invisible');
		change('secondmenuholder6','invisible');
		change('secondmenuholder7','invisible');
}

function showtab4() {
		change('secondmenuholder1','invisible');
		change('secondmenuholder2','invisible');
		change('secondmenuholder3','invisible');
		change('secondmenuholder4','visible');
		change('secondmenuholder5','invisible');
		change('secondmenuholder6','invisible');
		change('secondmenuholder7','invisible');
}
function showtab5() {
		change('secondmenuholder1','invisible');
		change('secondmenuholder2','invisible');
		change('secondmenuholder3','invisible');
		change('secondmenuholder4','invisible');
		change('secondmenuholder5','visible');
		change('secondmenuholder6','invisible');
		change('secondmenuholder7','invisible');
}
function showtab6() {
		change('secondmenuholder1','invisible');
		change('secondmenuholder2','invisible');
		change('secondmenuholder3','invisible');
		change('secondmenuholder4','invisible');
		change('secondmenuholder5','invisible');
		change('secondmenuholder6','visible');
		change('secondmenuholder7','invisible');
}
function showtab7() {
		change('secondmenuholder1','invisible');
		change('secondmenuholder2','invisible');
		change('secondmenuholder3','invisible');
		change('secondmenuholder4','invisible');
		change('secondmenuholder5','invisible');
		change('secondmenuholder6','invisible');
		change('secondmenuholder7','visible');
}