Issue waterbearlang#51: for now, catch errors and put in an alert. I'…

…m open to suggestions for better error reporting.

plugins/javascript.js

@@ -67,7 +67,7 @@ jQuery.fn.extend({
   wrap_script: function(){
       // wrap the top-level script to prevent leaking into globals
       var script = this.pretty_script();
-      return 'var global = new Global();(function($){var local = new Local();' + script + '})(jQuery);';
+      return 'var global = new Global();(function($){var local = new Local();try{' + script + '}catch(e){alert(e);}})(jQuery);';
   },
   pretty_script: function(){
       return js_beautify(this.map(function(){ return $(this).extract_script();}).get().join(''));