var version = "other"
var choice  = "prut"

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

version = "notok";
if (browserName == "Netscape" && browserVer >= 3) version = "ok";
else if (browserName == "Microsoft Internet Explorer" && browserVer >= 4) version = "ok";

function img_hover(imgName) {
   if (version == "ok" && choice != imgName) { document[imgName].src = "images/buttons/bt_h_" + imgName + ".gif"; }
}

function img_idle(imgName) {
   if (version == "ok" && choice != imgName) { document[imgName].src = "images/buttons/bt_i_" + imgName + ".gif"; }
}

function img_select(imgName) {
   if (version == "ok" && imgName != choice) {

      document['welkom'].src         = "images/buttons/bt_i_welkom.gif";
      document['sonnius'].src        = "images/buttons/bt_i_sonnius.gif";
      document['giften'].src         = "images/buttons/bt_i_giften.gif";
      document['producten'].src      = "images/buttons/bt_i_producten.gif";
      document['infokrant'].src      = "images/buttons/bt_i_infokrant.gif";
      document['seminarie'].src      = "images/buttons/bt_i_seminarie.gif";
      document['contact'].src        = "images/buttons/bt_i_contact.gif";

      document[imgName].src          = "images/buttons/bt_s_" + imgName + ".gif";
      choice=imgName;
   }
}