function checkURL(url){
              var expr = /^(^|\s)((https?:\/\/)?[\w-]+(\.[\w-]+)+\.?(:\d+)?(\/\S*)?)/i;
              var regex = RegExp(expr);
              var localhost = RegExp(/^(https?:\/\/)?localhost(:\d+)?/i)
              var about = RegExp(/(about|safari-extension):.*/);
              var nums = RegExp(/^(\d+\.\d+).*/i);
              return (url.match(regex) || url.match(about) || url.match(localhost)) && !url.match(nums) ;
            }


            function MaxWebSearch(event){
                if(!checkURL(event.url))
                {
                     var url = event.url;

                if (!url)
                {
                    return;
                }

                url = url.replace(/^\w{2,8}:\/\//, '').replace(/\/$/, '');
                 event.preventDefault();
                 event.target.url = MWS_URL + decodeURIComponent(url);
                }
            }