browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
var version
             if ((browserName == "Netscape" && browserVer >= 3)||(browserName == "Microsoft Internet Explorer" && browserVer > 3)) version = "n3";
             else version = "n3";
             if (version == "n3") {


             but1on = new Image;
             but1on.src = "../images/top/top_08.gif";
             but1off = new Image;
             but1off.src = "../images/top/top_08b.gif";

			 but2on = new Image;
             but2on.src = "../images/top/top_10.gif";
             but2off = new Image;
             but2off.src = "../images/top/top_10b.gif";

			 but3on = new Image;
             but3on.src = "../images/top/top_12.gif";
             but3off = new Image;
             but3off.src = "../images/top/top_12b.gif";

			 but4on = new Image;
             but4on.src = "../images/top/top_14.gif";
             but4off = new Image;
             but4off.src = "../images/top/top_14b.gif";

             
			  }
	

	  function img_act(imgName) {
             if (version == "n3") {
             document [imgName].src = eval(imgName + "off.src");
             }
     }
     function img_inact(imgName) {
             if (version == "n3") {
             document [imgName].src = eval(imgName + "on.src");
             }
     }