// rollover effects

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) {
		photobtn_over = newImage("images/pagestructure/photobtn_over.gif");
		webbtn_over = newImage("images/pagestructure/webbtn_over.gif");
		videobtn_over = newImage("images/pagestructure/videobtn_over.gif");
		preloadFlag = true;
	}
}