fixed bugs

app/models/slide.php

@@ -11,7 +11,7 @@ class Slide extends AppModel {
 				array('conditions'=>
 					array('Slide.enabled'=>1, 
 						'(Slide.start IS NULL OR Slide.start <= now())',
-						'(Slide.top IS NULL OR Slide.stop >= now())')));
+						'(Slide.stop IS NULL OR Slide.stop >= now())')));
 		
 		$enabledSlides = array_keys($enabledSlides);