Use tickLength instead of full length ticks

git-svn-id: https://flot.googlecode.com/svn/trunk@252 1e0a6537-2640-0410-bfb7-f154510ff394

examples/visitors.html

@@ -50,7 +50,7 @@ $(function () {
     }
     
     var options = {
-        xaxis: { mode: "time" },
+        xaxis: { mode: "time", tickLength: 5 },
         selection: { mode: "x" },
         grid: { markings: weekendAreas }
     };