function showHide () {
	var nav = document.getElementById("nav");
	var LI = nav.getElementsByTagName("li");
	
	for (var i = 0 ; i < LI.length ; i++) {
		if (LI[i].className.match(/Parent/)) {
			LI[i].getElementsByTagName("span")[0].onclick = function () {
				if(this.parentNode.className.match(/ParentActive/) == null) {
					
					for (var j = 0; j < LI.length ; j++) {
						if (LI[j].className.match(/ParentActive/)) {
							LI[j].className = LI[j].className.replace(/ParentActive/,"");
						}
					}
					this.parentNode.className += " ParentActive";
				}
				else {
					this.parentNode.className = this.parentNode.className.replace(/ParentActive/,"");
				}
			}
		}
	}
}

window.onload = function () {
		showHide();
}