   <!-- Script Copyright(C),1997-1999 by Anastas R. Safarov -->

          browserName = navigator.appName;
          browserVer = parseInt(navigator.appVersion);

		  version = "n2";
		  if (browserName == "Netscape") {
                       if (browserVer == 3) version ="n3";
		       if (browserVer > 3) version ="n4";
                  } else
		       if (browserVer > 3) version = "e4";

                  if (version == "n3" || version == "e4" || version == "n4") 
                  {
                   title0on = new Image(114, 16);
                   title0on.src = "../images/c20_h.gif";
                   title0off = new Image(114, 16);
                   title0off.src = "../images/c20_n.gif";
                   title1on = new Image(114, 16);
                   title1on.src = "../images/c01_h.gif";
                   title1off = new Image(114, 16);
                   title1off.src = "../images/c01_n.gif";
                   title2on = new Image(114, 16);
                   title2on.src = "../images/c24_h.gif";
                   title2off = new Image(114, 16);
                   title2off.src = "../images/c24_n.gif";
                   title3on = new Image(114, 26);
                   title3on.src = "../images/c03_h.gif";
                   title3off = new Image(114, 26);
                   title3off.src = "../images/c03_n.gif";
                   title4on = new Image(114, 26);
                   title4on.src = "../images/c21_h.gif";
                   title4off = new Image(114, 26);
                   title4off.src = "../images/c21_n.gif";
                   title5on = new Image(114, 26);
                   title5on.src = "../images/c05_h.gif";
                   title5off = new Image(114, 26);
                   title5off.src = "../images/c05_n.gif";
                   title6on = new Image(114, 26);
                   title6on.src = "../images/c06_h.gif";
                   title6off = new Image(114, 26);
                   title6off.src = "../images/c06_n.gif";
                   title7on = new Image(114, 26);
                   title7on.src = "../images/c22_h.gif";
                   title7off = new Image(114, 26);
                   title7off.src = "../images/c22_n.gif";
                   title8on = new Image(114, 26);
                   title8on.src = "../images/c23_h.gif";
                   title8off = new Image(114, 26);
                   title8off.src = "../images/c23_n.gif";
				   title9on = new Image(114, 26);
                   title9on.src = "../images/review1_h.gif";
                   title9off = new Image(114, 26);
                   title9off.src = "../images/review1_n.gif";
				   title10on = new Image(114, 26);
                   title10on.src = "../images/quizzes_h.gif";
                   title10off = new Image(114, 26);
                   title10off.src = "../images/quizzes_n.gif";
                  }

          function img_act(name) {
                  if (version == "n3") {
        		   imgOn = eval(name + "on.src");
                           document [name].src = imgOn;
                  }
		  if (version == "e4" || version == "n4")
		  {
                           imgOn = eval(name + "on.src");
                           tname = eval("document."+name);
		           tname.src = imgOn;
		  }
          }

          function img_inact(name) {
                  if (version == "n3") {
        		  imgOn = eval(name + "off.src");
                          document [name].src = imgOn;
                  }
		  if (version == "e4" || version == "n4")
		  {
                          imgOn = eval(name + "off.src");
                          tname = eval("document."+name);
		          tname.src = imgOn;
		  }
                 window.status = "";

          }
          function img_setactive(name,src)
          {
                  if (version == "n3") {
        		  imgOn = eval(name + "off.src");
                          document [name].src = src;
                  }
		  if (version == "e4" || version == "n4")
		  {
                          imgOn = eval(name + "off.src");
                          tname = eval("document."+name);
		          tname.src = src;
		  }

          }