if (document.images) 
   {
   a1 = new Image(134,20);
   a1.src = "images/home.gif";
   a2 = new Image(134,20);
   a2.src = "images/home_over.gif";

   b1 = new Image(134,20);
   b1.src = "images/services.gif";
   b2 = new Image(134,20);
   b2.src = "images/services_over.gif";

   c1 = new Image(134,20);
   c1.src = "images/physicians.gif";
   c2 = new Image(134,20);
   c2.src = "images/physicians_over.gif";

   d1 = new Image(134,20);
   d1.src = "images/locations.gif";
   d2 = new Image(134,20);
   d2.src = "images/locations_over.gif";

   e1 = new Image(134,20);
   e1.src = "images/patient.gif";
   e2 = new Image(134,20);
   e2.src = "images/patient_over.gif";

   f1 = new Image(134,20);
   f1.src = "images/faq.gif";
   f2 = new Image(134,20);
   f2.src = "images/faq_over.gif";

   g1 = new Image(134,20);
   g1.src = "images/resources.gif";
   g2 = new Image(134,20);
   g2.src = "images/resources_over.gif";

   h1 = new Image(134,20);
   h1.src = "images/worklink.gif";
   h2 = new Image(134,20);
   h2.src = "images/worklink_over.gif";

   i1 = new Image(134,20);
   i1.src = "images/inforx.gif";
   i2 = new Image(134,20);
   i2.src = "images/inforx_over.gif";

   j1 = new Image(134,20);
   j1.src = "images/spine.gif";
   j2 = new Image(134,20);
   j2.src = "images/spine_over.gif";
   
   k1 = new Image(134,20);
   k1.src = "images/contact.gif";
   k2 = new Image(134,20);
   k2.src = "images/contact_over.gif";

   l1 = new Image(134,20);
   l1.src = "images/forms.gif";
   l2 = new Image(134,20);
   l2.src = "images/forms_over.gif";
   }

function imgSwap(imgDocID,imgObjName) 
   {
   if (document.images) 
      { document.images[imgDocID].src = eval(imgObjName + ".src") }
   }