Preview now can be use at both ad_banner and ad_image,however it won't run correctly if user change its ad_banner at ad_image.

app/assets/javascripts/inc/modal-preview.js

@@ -4,7 +4,7 @@
 
 $(document).ready(function() {
 	$("a.preview_trigger").click(function(){
-		$(this).after("<p id='show_preview'></p>");
+		$(this).after("<span id='show_preview'></span>");
 		$.ajax({
 			type:"PUT",
 			url:$(this).attr("href"),