if (document.images) {

	nav01a = new Image(160,25);
    nav01a.src = "images/nav_about_over.gif";
    nav01b = new Image(160,25);
    nav01b.src = "images/nav_about.gif";
	
	nav02a = new Image(160,25);
    nav02a.src = "images/nav_government_over.gif";
    nav02b = new Image(160,25);
    nav02b.src = "images/nav_government.gif";
    
    nav03a = new Image(160,25);
    nav03a.src = "images/nav_education_over.gif";
    nav03b = new Image(160,25);
    nav03b.src = "images/nav_education.gif";
    
    nav04a = new Image(160,25);
    nav04a.src = "images/nav_profit_over.gif";
    nav04b = new Image(160,25);
    nav04b.src = "images/nav_profit.gif";
    
    nav05a = new Image(160,25);
    nav05a.src = "images/nav_publications_over.gif";
    nav05b = new Image(160,25);
    nav05b.src = "images/nav_publications.gif";
    
    nav06a = new Image(160,25);
    nav06a.src = "images/nav_resources_over.gif";
    nav06b = new Image(160,25);
    nav06b.src = "images/nav_resources.gif";
    
    nav07a = new Image(160,25);
    nav07a.src = "images/nav_job_over.gif";
    nav07b = new Image(160,25);
    nav07b.src = "images/nav_job.gif";
    
    nav08a = new Image(160,25);
    nav08a.src = "images/nav_press_over.gif";
    nav08b = new Image(160,25);
    nav08b.src = "images/nav_press.gif";
        
    nav09a = new Image(160,25);
    nav09a.src = "images/nav_consumer_over.gif";
    nav09b = new Image(160,25);
    nav09b.src = "images/nav_consumer.gif";
        
    nav10a = new Image(160,25);
    nav10a.src = "images/nav_search_over.gif";
    nav10b = new Image(160,25);
    nav10b.src = "images/nav_search.gif";
        
    nav11a = new Image(160,25);
    nav11a.src = "images/nav_site_over.gif";
    nav11b = new Image(160,25);
    nav11b.src = "images/nav_site.gif";
          
    nav12a = new Image(160,25);
    nav12a.src = "images/nav_contact_over.gif";
    nav12b = new Image(160,25);
    nav12b.src = "images/nav_contact.gif";
 
		}

    function img_act(imgName) {
    if (document.images) {
        aimgOn = eval(imgName + "a" + ".src");
                document [imgName].src = aimgOn;
                }

        }
   function img_inact(imgName) {
    if (document.images) {
        bimgOn = eval(imgName + "b"  + ".src");
        document [imgName].src = bimgOn;
        }
        }