function setupNav()
{	
	setHoverClasses('a.sdnav1', 'sdnav1', 'sdnav1ov');
	setHoverClasses('a.sdnav2', 'sdnav2', 'sdnav2ov');    
	setHoverClasses('a.sdnav3', 'sdnav3', 'sdnav3ov');    
	setHoverClasses('a.crumbs', 'crumbs', 'crumbson');
    
	hm = new HoverImg('home', '../images/nav/homeov.gif');    
    crn = new HoverImg('cranial', '../images/nav/cranialov.gif');
    gyn = new HoverImg('gyne', '../images/nav/gyneov.gif');
    spn = new HoverImg('spine', '../images/nav/spineov.gif');
    thr = new HoverImg('thor', '../images/nav/thorov.gif');
    abt = new HoverImg('about', '../images/nav/aboutov.gif');
    cnt = new HoverImg('contact', '../images/nav/contactov.gif');                    

}