function contentUpdate(ajax_url, chElement, meth)
{
	if(!meth)
	  meth = 'get';
  
	req = new Ajax.Request(ajax_url, 
	  {
		  method: meth,
			onCreate: function()
			{
				$(chElement).update(wait);
			}, // create()
			onSuccess: function(transport)
			{
				var write_in = $(chElement);
				write_in.update(transport.responseText);
			} // success
	  } // ajax obj.
	); // new Ajax
} // contentUpdate()