// main navigation rollover
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) {
		mainNavAbout_over = newImage("../images/mainNav/mainNavAbout-over.gif");
		mainNavPortfolio_over = newImage("../images/mainNav/mainNavPortfolio-over.gif");
		mainNavPhotography_over = newImage("../images/mainNav/mainNavPhotography-over.gif");
		mainNavContact_over = newImage("../images/mainNav/mainNavContact-over.gif");
		preloadFlag = true;
	}
}

// launch pop up
function OpenBrWindow(theURL,winName,features, myWidth, myHeight, isCenter) { //v3.0
	if(window.screen)if(isCenter)if(isCenter=="true"){
		var myLeft = (screen.width-myWidth)/2;
		var myTop = (screen.height-myHeight)/2;
		features+=(features!='')?',':'';
		features+=',left='+myLeft+',top='+myTop;
	}

	window.open(theURL,winName,features+((features!='')?',':'')+'width='+myWidth+',height='+myHeight);
}