Proposed change that makes script ie6+ compatible

This was important because I have a customer that runs IE in "Compatible" mode.  All other modern browsers should work fine with it too.

Changed all:
score[1].indexOf(KEYWORD)==-1

to:
jQuery.inArray(KEYWORD, score[1])==-1
Merge pull request #3 from dicer2000/patch-1

Proposed change that makes script ie6+ compatible