Test failure message will now show up in browsers like IE6

tools/browser-test.html

@@ -24,7 +24,7 @@
       catch ( e )
       {
           body.style.color = 'red';
-          body.innerHTML = '<p>' + e.toString() + '</p>' +
+          body.innerHTML = '<p>' + e.message + '</p>' +
               '<p><em>ease.js is not guaranteed to run properly within this ' +
               'browser.</em></p>' +
               '<p>If building ease.js, remember to run <tt>`make combine` ' +