var currentCategory = '';
var adsRotationFlag = 0;

function setActiveTab( id )
{
  switch(id)
  {
    case 'compose':
      document.getElementById('messages').src = '/images/messages-off-left.jpg';
      document.getElementById('compose').src = '/images/compose-on.jpg';
      document.getElementById('greetings').src = '/images/greetings-off-right.jpg';
      document.getElementById('contacts').src = '/images/contacts-off.jpg';
      document.getElementById('nav-right').src = '/images/nav-right-1.jpg';
      document.getElementById('nav-left').src = '/images/nav-left-2.jpg';
      break;
    case 'greetings':
      document.getElementById('messages').src = '/images/messages-off.jpg';
      document.getElementById('compose').src = '/images/compose-off-left.jpg';
      document.getElementById('greetings').src = '/images/greetings-on.jpg';
      document.getElementById('contacts').src = '/images/contacts-off-right.jpg';
      document.getElementById('nav-right').src = '/images/nav-right-1.jpg';
      document.getElementById('nav-left').src = '/images/nav-left-2.jpg';
      break;
    case 'contacts':
      document.getElementById('messages').src = '/images/messages-off.jpg';
      document.getElementById('compose').src = '/images/compose-off.jpg';
      document.getElementById('greetings').src = '/images/greetings-off-left.jpg';
      document.getElementById('contacts').src = '/images/contacts-on.jpg';
      document.getElementById('nav-right').src = '/images/nav-right-2.jpg';
      document.getElementById('nav-left').src = '/images/nav-left-2.jpg';
      break;
    case 'messages':
      document.getElementById('messages').src = '/images/messages-on.jpg';
      document.getElementById('compose').src = '/images/compose-off-right.jpg';
      document.getElementById('greetings').src = '/images/greetings-off.jpg';
      document.getElementById('contacts').src = '/images/contacts-off.jpg';
      document.getElementById('nav-right').src = '/images/nav-right-1.jpg';
      document.getElementById('nav-left').src = '/images/nav-left-1.jpg';
      break;
    default:
      document.getElementById('messages').src = '/images/messages-off.jpg';
      document.getElementById('compose').src = '/images/compose-off.jpg';
      document.getElementById('greetings').src = '/images/greetings-off.jpg';
      document.getElementById('contacts').src = '/images/contacts-off.jpg';
      document.getElementById('nav-right').src = '/images/nav-right-1.jpg';
      document.getElementById('nav-left').src = '/images/nav-left-2.jpg';
      break;
  }
}

iFrameID = 'mainContent';
function resizeIframe()
{
  iFrame = document.getElementById(iFrameID);
  if(iFrame && iFrame.Document)
  {
    iFrame.height = iFrame.Document.body.scrollHeight+10;
  }
  if(iFrame && iFrame.contentDocument)
  {
    iFrame.height = iFrame.contentDocument.body.offsetHeight + 30;
  }
}
window.onresize = resizeIframe;