if( !imageRoot || imageRoot == null ) {
		var imageRoot = "" ;
	}

// Netscape 3.0 compatibility test (for javascript image swapping)
	compat = false;
	if( parseInt( navigator.appVersion ) >= 3 ) {
		compat = true ; 
	}

// cache images for quick swapping
	if( compat ) {

		l_about = new Image();
		l_about.src = imageRoot + "/nav/l_about.gif";
		lo_about = new Image();
		lo_about.src = imageRoot + "/nav/lo_about.gif";

		l_bio = new Image();
		l_bio.src = imageRoot + "/nav/l_bio.gif";
		lo_bio = new Image();
		lo_bio.src = imageRoot + "/nav/lo_bio.gif";
		
		l_professionals = new Image();
		l_professionals.src = imageRoot + "/nav/l_professionals.gif";
		lo_professionals = new Image();
		lo_professionals.src = imageRoot + "/nav/lo_professionals.gif";
		
		l_careers = new Image();
		l_careers.src = imageRoot + "/nav/l_careers.gif";
		lo_careers = new Image();
		lo_careers.src = imageRoot + "/nav/lo_careers.gif";
	
		l_exp = new Image();
		l_exp.src = imageRoot + "/nav/l_exp.gif";
		lo_exp = new Image();
		lo_exp.src = imageRoot + "/nav/lo_exp.gif";
		
		l_home = new Image();
		l_home.src = imageRoot + "/nav/l_home.gif";
		lo_home = new Image();
		lo_home.src = imageRoot + "/nav/lo_home.gif";
	
		l_news = new Image();
		l_news.src = imageRoot + "/nav/l_news.gif";
		lo_news = new Image();
		lo_news.src = imageRoot + "/nav/lo_news.gif";
	
		l_offices = new Image();
		l_offices.src = imageRoot + "/nav/l_offices.gif";
		lo_offices = new Image();
		lo_offices.src = imageRoot + "/nav/lo_offices.gif";
	
		l_pubs = new Image();
		l_pubs.src = imageRoot + "/nav/l_pubs.gif";
		lo_pubs = new Image();
		lo_pubs.src = imageRoot + "/nav/lo_pubs.gif";
	
		l_services = new Image();
		l_services.src = imageRoot + "/nav/l_services.gif";
		lo_services = new Image();
		lo_services.src = imageRoot + "/nav/lo_services.gif";
	}
	

// swap images using the cached images
    function change(x, y) {
	    if( compat ) {
		    document.images[x].src=eval(y+'.src'); 
		    }
	}
	function setImage(name, location)
	{
	    document.images[name].src = location;
	}



//publication subscription
function uncheck(radiobutton)
{
    radiobutton.checked = false;

}