#nav-products    { left:0px;   width:172px; background:url(/images/nav_surfacetype_a.gif) transparent 0 0 no-repeat; }
#nav-technology  { left:172px; width:198px; background:url(/images/nav_technology_a.gif) transparent 0 0 no-repeat; }
#nav-casestudies { left:370px; width:174px; background:url(/images/nav_casestudies_a.gif) transparent 0 0 no-repeat; }
#nav-faq         { left:544px; width:95px;  background:url(/images/nav_faq_a.gif) transparent 0 0 no-repeat; }
#nav-contact     { left:639px; width:158px;  background:url(/images/nav_contact_a.gif) transparent 0 0 no-repeat; }

#nav-products.on, #nav-products a:hover, #nav-products a.hover          { background:url(/images/nav_surfacetype_b.gif) transparent 0 0 no-repeat; }
#nav-technology.on, #nav-technology a:hover, #nav-technology a.hover    { background:url(/images/nav_technology_b.gif) transparent 0 0 no-repeat; }
#nav-casestudies.on, #nav-casestudies a:hover, #nav-casestudies a.hover { background:url(/images/nav_casestudies_b.gif) transparent 0 0 no-repeat; }
#nav-faq.on, #nav-faq a:hover, #nav-faq a.hover                         { background:url(/images/nav_faq_b.gif) transparent 0 0 no-repeat; }
#nav-contact.on, #nav-contact a:hover, #nav-contact a.hover             { background:url(/images/nav_contact_b.gif) transparent 0 0 no-repeat; }