function setHome()
  {
    if (document.all)
    {
     document.body.style.behavior='url(#default#homepage)';
     document.body.setHomePage('http://www.mmc.nhs.uk');

    }
    else if (window.sidebar)
     {
         if(window.netscape)
         {
          try
          {
          netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
          }
       catch(e)
      {
    alert("If you would like to set this website as your homepage, please enter about:config in your address line in Firefox, and change the value of signed.applets.codebase_principal_support to 'true', then try this link again.");
}
}
var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components. interfaces.nsIPrefBranch);
prefs.setCharPref('browser.startup.homepage','http://www.mmc.nhs.uk');
}
}