diff --git a/app/assets/javascripts/toicontest.js b/app/assets/javascripts/toicontest.js
--- a/app/assets/javascripts/toicontest.js
+++ b/app/assets/javascripts/toicontest.js
@@ -1,7 +1,9 @@
 var TOIContest = {
     NO_TIMEOUT: -1,
+    SUBMISSION_TIMEOUT: 300,
     
     timeOuts: {},
+    timeStarted: 0,
     
     problemSelectClick: function() {
         $$(".submission-submit-divs").each(function(item) {
@@ -14,8 +16,18 @@
         $("submission_submit_div_" + problem_id + "_id").show();
     },
 
-    confirmDownload: function() {
-        return confirm("แน่ใจ?");
+    confirmDownload: function(pid) {
+        result = confirm("คุณแน่ใจที่จะส่งข้อนี้หรือไม่?\nเมื่อคุณดาวน์โหลดข้อมูลชุดทดสอบแล้ว คุณจะต้องส่งข้อมูลส่งออกและโปรแกรมภายในเวลา 5 นาที");
+        if ( result ) {
+            if ( TOIContest.timeOuts[ pid ] == TOIContest.NO_TIMEOUT ) {
+                TOIContest.refreshTimeOuts();
+
+                TOIContest.timeOuts[ pid ] = TOIContest.SUBMISSION_TIMEOUT;
+
+                TOIContest.refreshTimeOutMessages();
+            }
+        }
+        return result;
     },
 
     refreshTimeOutMessages: function() {
@@ -26,12 +38,40 @@
                     var minLeft = parseInt(timeOut / 60);
                     var secLeft = parseInt(timeOut % 60);
                     $('submission_time_left_' + pid + '_id').innerHTML = '| <b>เหลือเวลาอีก ' + minLeft + ':' + secLeft + ' นาที</b>';
+                    $('submission_form_'+ pid + '_id').show();
                 } else {
                     $('submission_time_left_' + pid + '_id').innerHTML = '| <b>หมดเวลาส่ง</a>';
                     $('submission_form_'+ pid + '_id').hide();
                 }
+            } else {
+                $('submission_form_'+ pid + '_id').hide();
             }
         }
-    }
+    },
+
+    refreshTimeOuts: function() {
+        if ( TOIContest.timeStarted == 0 ) {
+            TOIContest.timeStarted = (new Date()).getTime();
+        }
+        
+        var timeElapsed = ((new Date()).getTime() - TOIContest.timeStarted)/1000;
+        for ( var pid in TOIContest.timeOuts ) {
+            var timeOut = TOIContest.timeOuts[ pid ];
+            if ( timeOut > timeElapsed ) {
+                TOIContest.timeOuts[ pid ] -= timeElapsed;
+            } else if ( timeOut > 0 ) {
+                TOIContest.timeOuts[ pid ] = 0;
+            }
+        }
+    },
+    
+    registerRefreshEvent: function() {
+        TOIContest.timeStarted = (new Date()).getTime();
+        setTimeout(function () {
+            TOIContest.refreshTimeOuts();
+            TOIContest.refreshTimeOutMessages();
+            TOIContest.registerRefreshEvent();
+        }, 1000);
+    },
 };