if (document.images) {
	about_on = new Image();
	about_on.src = "/images/nav/about_on.gif"; 
	about_off = new Image();
	about_off.src = "/images/nav/about_off.gif";
	
	science_on = new Image();
	science_on.src = "/images/nav/science_on.gif"; 
	science_off = new Image();
	science_off.src = "/images/nav/science_off.gif";  
	
	activities_on = new Image();
	activities_on.src = "/images/nav/activities_on.gif"; 
	activities_off = new Image();
	activities_off.src = "/images/nav/activities_off.gif";  
	
	volunteer_on = new Image();
	volunteer_on.src = "/images/nav/volunteer_on.gif"; 
	volunteer_off = new Image();
	volunteer_off.src = "/images/nav/volunteer_off.gif";  
	
	news_on = new Image();
	news_on.src = "/images/nav/news_on.gif"; 
	news_off = new Image();
	news_off.src = "/images/nav/news_off.gif";  
	
	contact_on = new Image();
	contact_on.src = "/images/nav/contact_on.gif"; 
	contact_off = new Image();
	contact_off.src = "/images/nav/contact_off.gif";  
	
	support_on = new Image();
	support_on.src = "/images/nav/support_on.gif"; 
	support_off = new Image();
	support_off.src = "/images/nav/support_off.gif";  
	
}

function imgOn(imgName) {
	if (document.images) {
		document[imgName].src = eval(imgName + "_on.src");
	}
}

function imgOff(imgName) {
	if (document.images) {
		document[imgName].src = eval(imgName + "_off.src");
	}
}

// -->