if (document.images) {  // If the image object exists
                           //    define the image mapping
      // main navigation
      companyon          = new Image();
      companyon.src      = "/images/ispacewebnav/companyon.gif";
      serviceson         = new Image();
      serviceson.src     = "/images/ispacewebnav/serviceson.gif";
      newson             = new Image();
      newson.src         = "/images/ispacewebnav/newson.gif";
      supporton          = new Image();
      supporton.src      = "/images/ispacewebnav/supporton.gif";
      contactuson        = new Image();
      contactuson.src    = "/images/ispacewebnav/contactuson.gif";
      sitemapon          = new Image();
      sitemapon.src      = "/images/ispacewebnav/sitemapon.gif";
   }

function select (i) {
   if (document.images) {
      var src = document[i].src;
      var off = src.lastIndexOf("off");
      if (off !=-1) {
         var newsrc = src.substring(0, off) + "on";
         document[i].src=newsrc + ".gif";
      }
   }
}
	
function deselect (i) {
   if (document.images) {
      var src = document[i].src;
      var on = src.lastIndexOf("on");
      if (on !=-1) {
         var newsrc = src.substring(0, on) + "off";
         document[i].src=newsrc + ".gif";
      }
   }
}