if (document.images) {

   //main site nav
   
   b1on = new Image(51,29);
   b1on.src = "./images/b1on.gif";
   b1off = new Image(51,29);
   b1off.src = "./images/b1off.gif";
   
   b2on = new Image(60,29);
   b2on.src = "./images/b2on.gif";
   b2off = new Image(60,29);
   b2off.src = "./images/b2off.gif";
   
   b3on = new Image(84,29);
   b3on.src = "./images/b3on.gif";
   b3off = new Image(84,29);
   b3off.src = "./images/b3off.gif";
   
   b4on = new Image(189,29);
   b4on.src = "./images/b4on.gif";
   b4off = new Image(189,29);
   b4off.src = "./images/b4off.gif";
   
   b5on = new Image(79,29);
   b5on.src = "./images/b5on.gif";
   b5off = new Image(79,29);
   b5off.src = "./images/b5off.gif";
   
   
   //sub portfolio menu
   
   b6on = new Image(125,17);
   b6on.src = "./images/bsubltrOn.gif";
   b6off = new Image(125,17);
   b6off.src = "./images/bsubltrOff.gif";
   
   b7on = new Image(125,17);
   b7on.src = "./images/bsubsmOn.gif";
   b7off = new Image(125,17);
   b7off.src = "./images/bsubsmOff.gif";
   
   b8on = new Image(125,17);
   b8on.src = "./images/bsubmkgOn.gif";
   b8off = new Image(125,17);
   b8off.src = "./images/bsubmkgOff.gif";
   
   b9on = new Image(125,17);
   b9on.src = "./images/bsubcatOn.gif";
   b9off = new Image(125,17);
   b9off.src = "./images/bsubcatOff.gif";
   
   b10on = new Image(125,17);
   b10on.src = "./images/bsubadsOn.gif";
   b10off = new Image(125,17);
   b10off.src = "./images/bsubadsOff.gif";
   
   b11on = new Image(125,17);
   b11on.src = "./images/bsubpipOn.gif";
   b11off = new Image(125,17);
   b11off.src = "./images/bsubpipOff.gif";
   
   b12on = new Image(125,17);
   b12on.src = "./images/bsubpcOn.gif";
   b12off = new Image(125,17);
   b12off.src = "./images/bsubpcOff.gif";
   
   b13on = new Image(125,17);
   b13on.src = "./images/bsubadvOn.gif";
   b13off = new Image(125,17);
   b13off.src = "./images/bsubadvOff.gif";
   
   b14on = new Image(125,17);
   b14on.src = "./images/bsubmagOn.gif";
   b14off = new Image(125,17);
   b14off.src = "./images/bsubmagOff.gif";
   
   b15on = new Image(125,17);
   b15on.src = "./images/bsubwebOn.gif";
   b15off = new Image(125,17);
   b15off.src = "./images/bsubwebOff.gif";
   
   b16on = new Image(125,17);
   b16on.src = "./images/bsubcwOn.gif";
   b16off = new Image(125,17);
   b16off.src = "./images/bsubcwOff.gif";
 

}
function act(imgName) {
    if (document.images)
      document[imgName].src = eval(imgName + 'on.src');
}
function inact(imgName) {
  if (document.images)
    document[imgName].src = eval(imgName + 'off.src')
}