/*
 * Adds function to window.onload
 *
 * Usage:
 *   addLoadEvent(function() { alert('Hello!'); });
 */
function addLoadEvent(func)
{
  var oldOnLoad = window.onload;
  if(typeof window.onload != 'function')
  {
    window.onload = func;
  }
  else
  {
    window.onload = function()
    {
      if(oldOnLoad)
      {
        oldOnLoad();
      }
      func();
    }
  }
}