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) {
		menubutton_home_over = newImage("images/menubutton_home-over.jpg");
		menubutton_dr_gerlach_over = newImage("images/menubutton_dr.gerlach-over.jpg");
		menubutton_about_over = newImage("images/menubutton_about-over.jpg");
		menubutton_procedures_over = newImage("images/menubutton_procedures-over.jpg");
		menubutton_location_over = newImage("images/menubutton_location-over.jpg");
		menubutton_products_over = newImage("images/menubutton_products-over.jpg");
		menubutton_contactus_over = newImage("images/menubutton_contactus-over.jpg");
		preloadFlag = true;
	}
}




function show(object) {
    if (document.getElementById) {
         node = document.getElementById(object).style.visibility='visible';
	} else if (document.layers) {
        document.layers[object].visibility = 'visible';
	} else if (document.all) {
        document.all[object].style.visibility = 'visible';
	}
}

function hide(object) {
    if (document.getElementById) {
         node = document.getElementById(object).style.visibility='hidden';
	} else if (document.layers) {
        document.layers[object].visibility = 'hidden';
	} else if (document.all) {
        document.all[object].style.visibility = 'hidden';
	}
}

function initializeMenu() {
	hide('menuProcedures');
	hide('menuDoc');
}