window.onload = function(){

	// -------------------------------------------------------------------
	// calcola e assegna l'altezza del cover 
	// -------------------------------------------------------------------
	var body_y = document.getElementsByTagName("body")[0].offsetHeight;	
	// document.getElementById("cover").style.height = body_y + "px";
	
	
	// -------------------------------------------------------------------
	// nasconde i sottomenu laterali
	// -------------------------------------------------------------------
	var menu_lat = document.getElementById("menu_1");
	var a_ul = menu_lat.getElementsByTagName("ul");
		for(i=0; i < a_ul.length; i++){
			a_ul[i].style.display = "none"
		}
	
	
	
	var a_span = menu_lat.getElementsByTagName("span");
		for(i=0; i < a_span.length; i++){
			if(a_span[i].parentNode.getElementsByTagName("ul")[0].className == "active"){
				a_span[i].parentNode.getElementsByTagName("ul")[0].style.display = "block";
			}
			a_span[i].onclick = show_hide;
		}
	} // fine onload fine onload fine onload fine onload fine onload fine onload fine onload fine onload
	
	
// funzione che mostra e nasconde i sottomenu	
function show_hide(){
	if(this.parentNode.getElementsByTagName("ul")[0].style.display == "none"){
		this.parentNode.getElementsByTagName("ul")[0].style.display = "block";
		this.parentNode.getElementsByTagName("a")[0].style.fontWeight = "bold";  
		}
	else {
		this.parentNode.getElementsByTagName("ul")[0].style.display = "none";
		this.parentNode.getElementsByTagName("a")[0].style.fontWeight = "normal"; 
		}
	}
	
// funzione che chiude tutti i sottomenu		
function collapseMenus(){
	var menu_lat = document.getElementById("menu_1");
	var a_ul = menu_lat.getElementsByTagName("ul");
		for(i=0; i < a_ul.length; i++){
			a_ul[i].style.display = "none"
			}
		}