var newwindow = null;

function openWindow() {
	if (!newwindow || newwindow.closed) {
	    newwindow = window.open("login.html" ,"","width=300,height=100");
	}
	newwindow.focus();
}

function genopenwindow(url,wth,hgt,nme) {
		nme = window.open(url ,"","width="+ wth +",height=" + hgt + ",toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,copyhistory=no,resizable=no,left=0,top=0,screenX=0,screenY=0");
		
}


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) {
		home_on = newImage("images/nav_top_on_home.gif");
		shopping_on = newImage("images/nav_top_on_services.gif");
		account_on = newImage("images/nav_top_on_sponsors.gif");
		help_on = newImage("images/nav_top_on_help.gif");
		div_left = newImage("images/nav_top_div_left.gif");
		div_right = newImage("images/nav_top_div_right.gif");
		both_on = newImage("images/nav_top_both_on.gif");
		both_off = newImage("images/nav_top_both_off.gif");
		preloadFlag = true;
	}
}