IE < 10 does not support gradients.

Tom

2014-11-17 3f6995c70e8b15f7abf1785eb780a0de46f8bd07

 src/main/java/com/gitblit/wicket/pages/ComparePage.java

@@ -117,6 +117,9 @@
               fromCommit.getName(), toCommit.getName(), imageExtensions);

         final DiffOutput diff = DiffUtils.getDiff(r, fromCommit, toCommit, DiffOutputType.HTML, handler);
         if (handler.getImgDiffCount() > 0) {
            addBottomScript("scripts/imgdiff.js"); // Tiny support script for image diffs
         }

         // add compare diffstat
         int insertions = 0;