// rollover image function
function changeImage(image_name,image_src) {
   	document.images[image_name].src = image_src;
}

// preload images
function preloadImages(){
	
	if (document.images){
	
		var nav_home_over = new Image(47,26);
		nav_home_over.src = "images/nav_home_on.gif";
		
		var nav_products_over = new Image(86,26);
		nav_products_over.src = "images/nav_products_on.gif";
		
		var nav_feedback_over = new Image(47,26);
		nav_feedback_over.src = "images/nav_feedback_on.gif";
		
		var nav_aboutus_over = new Image(62,26);
		nav_aboutus_over.src = "images/nav_aboutus_on.gif";
		
		var nav_contact_over = new Image(55,26);
		nav_contact_over.src = "images/nav_contact_on.gif";
		
	} else {
		return;
	}
	
}

// event handler used for the navigation rollovers
sfHover = function(){
	var sfEls = document.getElementById("nav").getElementsByTagName("li");
	for (var i = 0; i < sfEls.length; i++){
		sfEls[i].onmouseover = function(){
			this.className += " sfhover";
			//document.getElementById("ultralingua").style.visibility = "hidden";
		}
		sfEls[i].onmouseout = function(){
			this.className = this.className.replace(new RegExp(" sfhover\\b"), "");
			//document.getElementById("ultralingua").style.visibility = "visible";
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);