Index: index.php
===================================================================
RCS file: /cvsroot/moodle/moodle/grade/report/grader/index.php,v
retrieving revision 1.65.2.15
diff -u -r1.65.2.15 index.php
--- index.php	5 May 2009 11:52:03 -0000	1.65.2.15
+++ index.php	25 Jun 2009 10:10:31 -0000
@@ -223,6 +223,7 @@
     YAHOO.graderreport.panelEl.render(table);
 
     document.body.className += ' yui-skin-sam';
+    YAHOO.graderreport.currentCell = '';
 
 }
 
@@ -290,6 +291,17 @@
         YAHOO.graderreport.panelEl.setBody(tooltipNode.innerHTML);
         YAHOO.graderreport.panelEl.render(elTarget);
         YAHOO.graderreport.panelEl.show()
+        
+        // Highlight the current cell
+        elTarget.className += ' current_cell';
+
+        // remove the highlight from the old cell
+        if ((typeof(YAHOO.graderreport.currentCell) == 'object')) {
+            YAHOO.graderreport.currentCell.className = YAHOO.graderreport.currentCell.className.replace(' current_cell', '');
+        }
+        // store this cell reference so that this class can be removed on mouseout
+        YAHOO.graderreport.currentCell = elTarget;
+
     }
 }
 
@@ -306,6 +318,7 @@
         classVar = newTarget.className;
     } catch (err) {
         YAHOO.graderreport.panelEl.hide()
+        YAHOO.graderreport.currentCell.className = YAHOO.graderreport.currentCell.className.replace('current_cell', '');
         return false;
     }
 
@@ -318,6 +331,9 @@
         } catch (err) {
             // we've gone over the scrollbar again
             YAHOO.graderreport.panelEl.hide()
+            if ((typeof(YAHOO.graderreport.currentCell) == 'object') ) {
+                YAHOO.graderreport.currentCell.className = YAHOO.graderreport.currentCell.className.replace('current_cell', '');
+            }
             return false;
         }
         searchString = /yui-panel|grade cell/;
@@ -329,6 +345,9 @@
         if (newTarget.nodeName.toUpperCase() == "HTML") {
             // we missed the user-grades table altogether by moving down off screen to read a long one
             YAHOO.graderreport.panelEl.hide()
+            if ((typeof(YAHOO.graderreport.currentCell) == 'object') ) {
+                YAHOO.graderreport.currentCell.className = YAHOO.graderreport.currentCell.className.replace('current_cell', '');
+            }
             break;
         }
 
@@ -337,7 +356,12 @@
 
     // no panel so far and we went up to the
     YAHOO.graderreport.panelEl.hide()
-
+    if ((typeof(YAHOO.graderreport.currentCell) == 'object') ) {
+        YAHOO.graderreport.currentCell.className = YAHOO.graderreport.currentCell.className.replace('current_cell', '');
+        // remove the reference now that we have hidden everything. This stops problems when coming back in to the table
+        // from the edge
+        YAHOO.graderreport.currentCell = '';
+    }
 }
 
 
Index: styles.php
===================================================================
RCS file: /cvsroot/moodle/moodle/grade/report/grader/styles.php,v
retrieving revision 1.1.2.17
diff -u -r1.1.2.17 styles.php
--- styles.php	5 Jun 2009 09:34:31 -0000	1.1.2.17
+++ styles.php	25 Jun 2009 10:12:24 -0000
@@ -571,5 +571,7 @@
 #hiddentooltiproot, .tooltipDiv {
   display: none;
 }
-
+.grade-report-grader table#user-grades td.grade.cell.current_cell {
+  background-color: #D9D9F3 !important;
+}