//Menu function
      var cur_menu;
      function on(num) {
        if (num != active_menu) {
          cur_menu = num;
          off(active_menu);
        }
        eval("document.menu_"+num+".src='images/btn/btn_"+num+".gif'");
        eval("document.menu_"+num+"_tab.src='images/btn/btn_tab_"+num+"c.gif'");

	    if (num<=3) eval("document.menu_"+(num*1+1)+"_tab.src='images/btn/btn_tab_"+(num*1+1)+"b.gif'");

        cur_menu = '';
      }
      function off(num) {
        eval("document.menu_"+num+".src='images/btn/btn_"+num+"_on.gif'");
        eval("document.menu_"+num+"_tab.src='images/btn/btn_tab_"+num+"a.gif'");
	    if (num<=3) eval("document.menu_"+(num*1+1)+"_tab.src='images/btn/btn_tab_"+(num*1+1)+"a.gif'");
        if (!cur_menu) on(active_menu);
      }


	//Popup function
    var isNav4, isIE4, isMac;
    if (parseInt(navigator.appVersion.charAt(0)) >= 4) {
      isNav4 = (navigator.appName == "Netscape") ? true : false
      isNav6 = (navigator.appName == "Netscape" && parseInt(navigator.appVersion) == 5) ? true : false
      isIE4  = (navigator.appName.indexOf("Microsoft") != -1) ? true : false
      isMac  = (navigator.platform.indexOf("Mac") != -1) ? true : false
    }

    function popup(url, name, width, height) {
      if (isNav4 || isIE4) {
        var screenPosX,screenPosY;
        screenPosX = (screen.availWidth - width) / 2;
        screenPosY = (screen.availHeight - height) / 2;
        if (isNav4 || isNav6) {
          window.open(url, name,'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0, copyhistory=0,width='+width+',height='+height+',screenX='+screenPosX+',screenY='+screenPosY+'');
        }
        if (isIE4) {
          newwin = window.open(url, name,'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0, copyhistory=0,width='+width+',height='+height+',left='+screenPosX+',top='+screenPosY+'');    
        }
      } else {
        window.open(url, name,'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0, copyhistory=0,width='+width+',height='+height);
      }
    }