function navaan(event)
{
	var ObjParentOpen = document.getElementById(event);
	if(ObjParentOpen.style.display == 'block')
		{
			ObjParentOpen.style.display = 'none';
		}
	else
	  {
	   if(ObjParentOpen.style.display == 'none')
		   {
			  ObjParentOpen.style.display = 'block';
		   }
    }
}