function callback_show_error ( error_div_id, error_message )
{
	if ( typeof error_div_id == 'undefined' ||  error_div_id == '' )
	{
		alert ( "Developer's Error:  You must pass a div_id into callback_show_error.js" );
	}
	
	if ( typeof error_message == 'undefined' || error_message == '' )
	{
		//var error_message = "An error has occurred.";	
		return;
	}
	
	$(error_div_id).innerHTML = error_message;
	$(error_div_id).style.display = 'block';
}