diff --git a/rhodecode/templates/pullrequests/pullrequest.html b/rhodecode/templates/pullrequests/pullrequest.html
--- a/rhodecode/templates/pullrequests/pullrequest.html
+++ b/rhodecode/templates/pullrequests/pullrequest.html
@@ -53,7 +53,7 @@
                     <img id="other_repo_gravatar" alt="gravatar" src=""/>
                 </div>
                 <span style="font-size: 20px">
-                ${h.select('other_repo',c.default_pull_request ,c.other_repos,class_='refs')}:${h.select('other_ref','',c.default_revs,class_='refs')}
+                ${h.select('other_repo',c.default_pull_request ,c.other_repos,class_='refs')}:${h.select('other_ref',c.default_pull_request_rev,c.default_revs,class_='refs')}
                 </span>
                  <div id="other_repo_desc" style="padding:5px 3px 3px 42px;"></div>
             </div>
@@ -135,6 +135,7 @@
   PullRequestAutoComplete('user', 'reviewers_container', _USERS_AC_DATA, _GROUPS_AC_DATA);
 
   var other_repos_info = ${c.other_repos_info|n};
+  
   var loadPreview = function(){
 	  YUD.setStyle(YUD.get('pull_request_overview_url').parentElement,'display','none');
       var url = "${h.url('compare_url',
@@ -145,28 +146,38 @@
                          as_form=True)}";
 
       var select_refs = YUQ('#pull_request_form select.refs')
-
+      var rev_data = {}; // gather the org/other ref and repo here
       for(var i=0;i<select_refs.length;i++){
         var select_ref = select_refs[i];
         var select_ref_data = select_ref.value.split(':');
         var key = null;
         var val = null;
+        
         if(select_ref_data.length>1){
           key = select_ref.name+"_type";
           val = select_ref_data[0];
           url = url.replace(key,val);
-
+          rev_data[key] = val;
+          
           key = select_ref.name;
           val = select_ref_data[1];
           url = url.replace(key,val);
-
+          rev_data[key] = val;
+          
         }else{
           key = select_ref.name;
           val = select_ref.value;
           url = url.replace(key,val);
+          rev_data[key] = val;
         }
       }
 
+      YUE.on('other_repo', 'change', function(e){
+    	  var repo_name = e.currentTarget.value;
+    	  // replace the <select> of changed repo
+    	  YUD.get('other_ref').innerHTML = other_repos_info[repo_name]['revs'];
+      });
+      
       ypjax(url,'pull_request_overview', function(data){
     	  var sel_box = YUQ('#pull_request_form #other_repo')[0];
     	  var repo_name = sel_box.options[sel_box.selectedIndex].value;
@@ -175,6 +186,8 @@
     	  YUD.get('other_repo_gravatar').src = other_repos_info[repo_name]['gravatar'];
     	  YUD.get('other_repo_desc').innerHTML = other_repos_info[repo_name]['description'];
     	  YUD.get('other_ref').innerHTML = other_repos_info[repo_name]['revs'];
+    	  // select back the revision that was just compared
+    	  setSelectValue(YUD.get('other_ref'), rev_data['other_ref']);
       })
   }
   YUE.on('refresh','click',function(e){