//preload top nav images
if (document.images) {

  nav_welding = new Image(85,19);
  nav_welding.src = "http://media.whydevelop.com/o/store.oxarc.com/imgs/nav_top_welding.gif";
  nav_welding_on = new Image(95,19);
  nav_welding_on.src = "http://media.whydevelop.com/o/store.oxarc.com/imgs/nav_top_welding_on.gif";

  nav_safety = new Image(85,19);
  nav_safety.src = "http://media.whydevelop.com/o/store.oxarc.com/imgs/nav_top_safety.gif";
  nav_safety_on = new Image(95,19);
  nav_safety_on.src = "http://media.whydevelop.com/o/store.oxarc.com/imgs/nav_top_safety_on.gif";

  nav_industrial = new Image(85,19);
  nav_industrial.src = "http://media.whydevelop.com/o/store.oxarc.com/imgs/nav_top_industrial.gif";
  nav_industrial_on = new Image(95,19);
  nav_industrial_on.src = "http://media.whydevelop.com/o/store.oxarc.com/imgs/nav_top_industrial_on.gif";

  nav_clearance = new Image(85,19);
  nav_clearance.src = "http://media.whydevelop.com/o/store.oxarc.com/imgs/nav_top_clearance.gif";
  nav_clearance_on = new Image(95,19);
  nav_clearance_on.src = "http://media.whydevelop.com/o/store.oxarc.com/imgs/nav_top_clearance_on.gif";

  nav_used = new Image(85,19);
  nav_used.src = "http://media.whydevelop.com/o/store.oxarc.com/imgs/nav_top_used.gif";
  nav_used_on = new Image(95,19);
  nav_used_on.src = "http://media.whydevelop.com/o/store.oxarc.com/imgs/nav_top_used_on.gif";

  nav_order_pad = new Image(85,19);
  nav_order_pad.src = "http://media.whydevelop.com/o/store.oxarc.com/imgs/nav_top_order_pad.gif";
  nav_order_pad_on = new Image(95,19);
  nav_order_pad_on.src = "http://media.whydevelop.com/o/store.oxarc.com/imgs/nav_top_order_pad_on.gif";

  nav_logo_back = new Image(105,81);
  nav_logo_back.src = "http://media.whydevelop.com/o/store.oxarc.com/imgs/logo_oxarc.gif";
  nav_logo_back_on = new Image(108,83);
  nav_logo_back_on.src = "http://media.whydevelop.com/o/store.oxarc.com/imgs/back_to_oxarc.gif";

}

//rollover function
function swapIt(imgDocID,imgObjName) {

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

}