browserName = navigator.appName;
     browserVer = parseInt(navigator.appVersion);
             if ((browserName == "Netscape" && browserVer >= 3) ||
(browserName == "Microsoft Internet Explorer" && browserVer >= 4)) version
= "n3";
             else version = "n2";

             if (version == "n3") {
             tocaoff = new Image;
             tocaoff.src = "../images2/toc_a.gif";
             tocboff = new Image;
             tocboff.src = "../images2/toc_b.gif";
             toccoff = new Image;
             toccoff.src = "../images2/toc_c.gif";
             tocdoff = new Image;
             tocdoff.src = "../images2/toc_d.gif";
             toceoff = new Image
             toceoff.src = "../images2/toc_e.gif";
             tocfoff = new Image;
             tocfoff.src = "../images2/toc_f.gif";
             tocgoff = new Image;
             tocgoff.src = "../images2/toc_g.gif";
             tochoff = new Image;
             tochoff.src = "../images2/toc_h.gif";
             tocioff = new Image;
             tocioff.src = "../images2/toc_i.gif";
             tockoff = new Image;
             tockoff.src = "../images2/toc_k.gif";
             tocloff = new Image;
             tocloff.src = "../images2/toc_l.gif";
             tocvoff = new Image;
             tocvoff.src = "../images2/toc_v.gif";
             tocxoff = new Image;
             tocxoff.src = "../images2/toc_x.gif";
             tocyoff = new Image;
             tocyoff.src = "../images2/toc_y.gif";
             toczoff = new Image;
             toczoff.src = "../images2/toc_z.gif";
             
             tocaon = new Image;
             tocaon.src = "../images2/toc_a-over.gif";
             tocbon = new Image;
             tocbon.src = "../images2/toc_b-over.gif";
             toccon = new Image;
             toccon.src = "../images2/toc_c-over.gif";
             tocdon = new Image;
             tocdon.src = "../images2/toc_d-over.gif";
             toceon = new Image
             toceon.src = "../images2/toc_e-over.gif";
             tocfon = new Image;
             tocfon.src = "../images2/toc_f-over.gif";
             tocgon = new Image;
             tocgon.src = "../images2/toc_g-over.gif";
             tochon = new Image;
             tochon.src = "../images2/toc_h-over.gif"   
             tocion = new Image;
             tocion.src = "../images2/toc_i-over.gif";   
             tockon = new Image;
             tockon.src = "../images2/toc_k-over.gif";   
             toclon = new Image;
             toclon.src = "../images2/toc_l-over.gif";
             tocvon = new Image;
             tocvon.src = "../images2/toc_v-over.gif";
             tocxon = new Image;
             tocxon.src = "../images2/toc_x-over.gif";
             tocyon = new Image;
             tocyon.src = "../images2/toc_y-over.gif"   
             toczon = new Image;
             toczon.src = "../images2/toc_z-over.gif";
				 }

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