nav_aboutus_off = new Image();
nav_aboutus_off.src = "/images/en_US/0608_nav_aboutus_off.gif";
nav_aboutus_on = new Image();
nav_aboutus_on.src = "/images/en_US/0608_nav_aboutus_on.gif";

nav_facphys_off = new Image();
nav_facphys_off.src = "/images/en_US/0608_nav_facphys_off.gif";
nav_facphys_on = new Image();
nav_facphys_on.src = "/images/en_US/0608_nav_facphys_on.gif";

nav_news_off = new Image();
nav_news_off.src = "/images/en_US/0608_nav_news_off.gif";
nav_news_on = new Image();
nav_news_on.src = "/images/en_US/0608_nav_news_on.gif";

function imageon(imagename) {
	imgOn = eval(imagename + "_on.src");
	document[imagename].src = imgOn;
}

function imageoff(imagename) {
	imgOff = eval(imagename + "_off.src");
	document[imagename].src = imgOff;
}