// script layer menu
var netscape = (navigator.appName.indexOf("Netscape") >= 0 && parseFloat(navigator.appVersion) >= 4) ? true : false;
var explorer = (document.all) ? true : false;
function HideLayer(layer) { 
	if (netscape) document[layer].visibility = "hide"; 
	if (explorer) document.all[layer].style.visibility = "hidden"; 
}
function ShowLayer(layer) { 
	if (netscape) document[layer].visibility = "show"; 
	if (explorer) document.all[layer].style.visibility = "visible";
}


// script menu
function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		About_us_button_over = newImage("images/About_us_button-over.gif");
		Services_button_over = newImage("images/Services_button-over.gif");
		Products_button_over = newImage("images/Products_button-over.gif");
		case_studies_button_over = newImage("images/case_studies_button-over.gif");
		contact_us_button_over = newImage("images/contact_us_button-over.gif");
		preloadFlag = true;
	}
}