// ID's fuer die PopUp-Menues
var menuID = new Array();
menuID [0] = "home";
menuID [1] = "portfolio";
menuID [2] = "profil";
menuID [3] = "feedback";
menuID [4] = "links";
menuID [5] = "kontakt";

//PopUp - Menue
function submenue(id)
{
 // Nicht aktuelle Menues zuklappen
 var x = menuID.length;
 for (i = 0; i < x ; i++)
 		 {
		 	if (id == menuID[i]) continue;
 		 	document.getElementById(menuID[i]).style.display = 'none';
		 }
 // ...und das aktuelle auf
 if(document.getElementById(id).style.display == 'none')
 {
 	document.getElementById(id).style.display = 'block';
 }
}