function display(id) {
	//var ul= document.getElementById(id);
	var i,//increment
		uli = [];//array which contains the lists with submenus from menu.html file
	uli[0]=document.getElementById("nav1");
	uli[1]=document.getElementById("nav2");
	uli[2]=document.getElementById("nav3");
	uli[3]=document.getElementById("nav4");
	uli[4]=document.getElementById("nav5");
	for(i=0; i<5; i++){
		var j=i+1;
		// the submenu selected will be desplayed
		if (id == "nav"+j) {
			if (uli[i].style.display == 'none') {
				uli[i].style.display = 'block';
			}
		}
		//the other submenu which was selected will be hidden
		else {
			if(uli[i].style.display == 'block') {
				uli[i].style.display = 'none';
			}
		}

	}

	
}


function changeIt(pic_id,dir) 
	{
         document.getElementById("big_pic").src="bilder/" + dir+ "/" + pic_id + ".jpg";
    }