var browser, verStr = navigator.appVersion, app = navigator.appName, version = parseFloat(verStr);

function test_browser () {
  if ((app.indexOf('Netscape') != -1) && version >= 5) {
    browser = "netscape";
  }
  else if ((app.indexOf('Microsoft') != -1) && version >= 4) {
    browser = "ie";
  }
}

var category_array = new Array(
  "m2", "m3", "m4", "m5", "m6"
);

function show_sub(show_which_sub, var_array) {

  if (show_which_sub != "") {
    if (browser == "netscape") {
      if (document.getElementById(show_which_sub).style.display == 'block') {
        document.getElementById(show_which_sub).style.display = 'none';
      }
      else {
        document.getElementById(show_which_sub).style.display = 'block';
      }
    }
    else if (browser == "ie") {
      show_menu = eval(show_which_sub);
      if(show_menu.style.display == 'block'){
        show_menu.style.display = 'none';    
      } 
      else {
        show_menu.style.display = 'block';    
      }

    }
    //setTimeout('auto_hide()', 10000);
  }
  for (i = 0; i < eval(var_array + ".length"); i++) {
    if (eval(var_array + "[i]") != show_which_sub) {
      hide_sub(eval(var_array + "[i]"));
    }    
  }
}

function hide_sub(which_sub) {  
  if (browser == "netscape") {
    document.getElementById(which_sub).style.display = 'none'; 
  }
  else if (browser == "ie") { 
    sub_menu = eval(which_sub); 
    sub_menu.style.display = 'none';    
  }
}

function auto_hide() {
  show_sub("");
}