/*
*/
function showNavigation(){
	//if pressed attach class="sub" to the li
	if(this.parentNode.className != "sub"){
		this.parentNode.className = "sub"
		c = this.parentNode.getElementsByTagName("ul");
		c[0].className = "";
		return false;
	}else{
		this.parentNode.className = "not-sub"
		c = this.parentNode.getElementsByTagName("ul");
		c[0].className = "hidden";
		return false;
	}
	//give the class="show" to the ul under li
	return false;
}