function clientBrowser(vNetscape, vExplorer) {
	return (((navigator.appVersion.substring(0,3) >= vNetscape) && (navigator.appName.substring(0,8) == 'Netscape')) || ((navigator.appVersion.substring(0,3) >= vExplorer) && (navigator.appName.substring(0,9) == 'Microsoft')));
}

function imagePreload(imageSource) {
	var newImage = new Image();
	newImage.src = imageSource;
	return newImage;
}

function rnavhi(ximg) {
	if(!clientBrowser(3,4)) return;
	var nimg = eval(ximg.name + '_ni');
	if((nimg.src == '')||(nimg.complete == false)) nimg.src = ximg.src;
	ximg.src = eval(ximg.name + '_hi').src;
}

function rnavni(ximg) {
	if(!clientBrowser(3,4)) return;
	ximg.src = eval(ximg.name + '_ni').src;
}