n1 = new Image();      n1.src = "_img/_nav/nav_1_lo.jpg";
h1 = new Image();      h1.src = "_img/_nav/nav_1_hi.jpg";
n2 = new Image();      n2.src = "_img/_nav/nav_2_lo.jpg";
h2 = new Image();      h2.src = "_img/_nav/nav_2_hi.jpg";
n3 = new Image();      n3.src = "_img/_nav/nav_3_lo.jpg";
h3 = new Image();      h3.src = "_img/_nav/nav_3_hi.jpg";
n4 = new Image();      n4.src = "_img/_nav/nav_4_lo.jpg";
h4 = new Image();      h4.src = "_img/_nav/nav_4_hi.jpg";
n5 = new Image();      n5.src = "_img/_nav/nav_5_lo.jpg";
h5 = new Image();      h5.src = "_img/_nav/nav_5_hi.jpg";
n6 = new Image();      n6.src = "_img/_nav/nav_6_lo.jpg";
h6 = new Image();      h6.src = "_img/_nav/nav_6_hi.jpg";

var Bildname,Bildobjekt;

function ImgSwap(Bildname,Bildobjekt)
{
   if (document.images)
   {
      var a = document[Bildname].name;
      document[a].src = Bildobjekt.src;
   }
}


browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);

ns3up = (browserName == "Netscape" && browserVer >= 3);
ie4up = (browserName.indexOf("Microsoft") >= 0 && browserVer >= 4);

function doPic(imgName) 
{
   if (ns3up || ie4up)
   {
      imgOn = ("" + imgName);
      document.mainpic.src = imgOn;
   }
}