diff --git a/boards/static/js/refpopup.js b/boards/static/js/refpopup.js
--- a/boards/static/js/refpopup.js
+++ b/boards/static/js/refpopup.js
@@ -46,8 +46,9 @@ function addRefLinkPreview(node) {
 
 function showPostPreview(e) {
     var doc = document;
-    //ref id
-    var pNum = $(this).text().match(/\d+/);
+
+    var reflink = $(this);
+    var pNum = reflink.text().match(/\d+/);
 
     if (pNum == null || pNum.length == 0) {
         return;
@@ -57,8 +58,8 @@ function showPostPreview(e) {
     if (post.length > 0 && isElementInViewport(post)) {
         post.addClass('highlight');
     } else {
-        var x = e.clientX + (doc.documentElement.scrollLeft || doc.body.scrollLeft) + 2;
-        var y = e.clientY + (doc.documentElement.scrollTop || doc.body.scrollTop);
+        var x = reflink.offset().left;
+        var y = reflink.offset().top;
 
         var cln = doc.createElement('div');
         cln.id = 'pstprev_' + pNum;