if (document.images)
	{
		img1on = new Image();   img1on.src = "images/nav-websites-on.gif"; 
		img2on = new Image();   img2on.src = "images/nav-services-on.gif";  
		img3on = new Image();   img3on.src = "images/nav-solutions-on.gif";
		img4on = new Image();   img4on.src = "images/nav-work-on.gif";
		img5on = new Image();   img5on.src = "images/nav-who-on.gif";
		img6on = new Image();   img6on.src = "images/nav-contact-on.gif";
		img7on = new Image();   img7on.src = "images/nav-testimonials-on.gif";
		img8on = new Image();   img8on.src = "images/nav-casestudies-on.gif";
		img9on = new Image();   img9on.src = "images/nav-news-on.gif";
		img10on = new Image();  img10on.src = "images/nav-signup-on.gif";
		img11on = new Image();  img11on.src = "images/nav-refer-on.gif";
		img12on = new Image();  img12on.src = "images/nav-email-on.gif";   
		img13on = new Image();  img13on.src = "portfolio/images/previous-on.gif";	
		img14on = new Image();  img14on.src = "portfolio/images/next-on.gif";		
		img15on = new Image();  img15on.src = "portfolio/images/return-port-on.gif";		 
		img16on = new Image();  img16on.src = "portfolio/images/view-on.gif";	
		img17on = new Image();  img17on.src = "portfolio/images/case-on.gif";	
		img18on = new Image();  img18on.src = "portfolio/images/return-details-on.gif";									
		
		img1off = new Image();   img1off.src = "images/nav-websites-off.gif"; 
		img2off = new Image();   img2off.src = "images/nav-services-off.gif";  
		img3off = new Image();   img3off.src = "images/nav-solutions-off.gif";
		img4off = new Image();   img4off.src = "images/nav-work-off.gif";
		img5off = new Image();   img5off.src = "images/nav-who-off.gif";
		img6off = new Image();   img6off.src = "images/nav-contact-off.gif";
		img7off = new Image();   img7off.src = "images/nav-testimonials-off.gif";
		img8off = new Image();   img8off.src = "images/nav-casestudies-off.gif";
		img9off = new Image();   img9off.src = "images/nav-news-off.gif";
		img10off = new Image();  img10off.src = "images/nav-signup-off.gif";
		img11off = new Image();  img11off.src = "images/nav-refer-off.gif";
		img12off = new Image();  img12off.src = "images/nav-email-off.gif";		
		img13off = new Image();  img13off.src = "portfolio/images/previous-off.gif";	
		img14off = new Image();  img14off.src = "portfolio/images/next-off.gif";			
		img15off = new Image();  img15off.src = "portfolio/images/return-port-off.gif";	
		img16off = new Image();  img16off.src = "portfolio/images/view-off.gif";	
		img17off = new Image();  img17off.src = "portfolio/images/case-off.gif";	
		img18off = new Image();  img18off.src = "portfolio/images/return-details-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");        
            }
    }