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) {
		 contact = newImage("images/new_nav/contact_over.gif");	
		 nonsurgical = newImage("images/new_nav/nonsurgical_over.gif");
		 ouroffice = newImage("images/new_nav/ouroffice_over.gif");
		 skincare = newImage("images/new_nav/skincare_over.gif");
		 surgery = newImage("images/new_nav/surgery_over.gif");
		 videoimaging = newImage("images/new_nav/videoimaging_over.gif");
		 watchasurgery = newImage("images/new_nav/watchasurgery_mo.gif");
		 welcomevideo = newImage("images/new_nav/welcomevideo_over.gif");
		 whatpatientssay = newImage("images/new_nav/whatpatientssay_over.gif");
		 whatsnew = newImage("images/new_nav/whatsnew_over.gif");
		 preloadFlag = true;
	}
}