Prevent i from being declared global in extractRange (issue 627)

NEWS.txt

@@ -50,6 +50,8 @@ Bug fixes
   (reported by Ara Anjargolian).
 - Fix bug with formats in the data processor (reported by Peter Hull,
   issue 534).
+- Prevent i from being declared global in extractRange (reported by
+  Alexander Obukhov, issue 627).
 
 
 Flot 0.7

jquery.flot.js

@@ -1483,7 +1483,7 @@
         function extractRange(ranges, coord) {
             var axis, from, to, key, axes = allAxes();
 
-            for (i = 0; i < axes.length; ++i) {
+            for (var i = 0; i < axes.length; ++i) {
                 axis = axes[i];
                 if (axis.direction == coord) {
                     key = coord + axis.n + "axis";