//image 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) {
		btn_home_ = newImage("/img/btn_home_.gif");
		btn_contact_us_ = newImage("/img/btn_contact_us_.gif");
		side_nav_camx_ = newImage("/img/side_nav_camx_.gif");
		side_nav_over_ = newImage("/img/side_nav_over_.gif");
		side_nav_down_ = newImage("/img/side_nav_down_.gif");
		side_nav_pub_ = newImage("/img/side_nav_pub_.gif");
		ide_nav_cont_ = newImage("/img/side_nav_cont_.gif");
		preloadFlag = true;
	}
}