//
// Helper functions for common components
// Kevin Roast 12-04-2005
//
// Menu component functions
var _lastMenu = null;
// toggle a dynamic menu dropping down
function _toggleMenu(e, menuId)
{
   // hide any open menu
   if (_lastMenu != null && _lastMenu != menuId)
   {
      document.getElementById(_lastMenu).style.display = 'none';
      _lastMenu = null;
   }
   
   // toggle visibility of the specified element id
   if (document.getElementById(menuId).style.display == 'none')
   {
      document.getElementById(menuId).style.display = 'block';
      
      _lastMenu = menuId;
      
      // set global onclick handler to hide menu
   	e.cancelBubble = true;
   	if (e.stopPropagation)
   	{
   	   e.stopPropagation();
   	}
      document.onclick = _hideLastMenu;
   }
   else
   {
      document.getElementById(menuId).style.display = 'none';
      document.onclick = null;
   }
}
// Hide the last opened menu
function _hideLastMenu()
{
   if (_lastMenu != null)
   {
      document.getElementById(_lastMenu).style.display = 'none';
      _lastMenu = null;
      document.onclick = null;
   }
}