HOW TO USE YUI COMPRESSION
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To use YUI Compression for JavaScript and CSS code, you need:
1- java installed and working on the server
2- YUI Compressor .jar file on the same directory as this file, with
   "yuicompressor.jar" as name. You can get it here:
   http://yuilibrary.com/downloads/#yuicompressor
3- PHP's shell_exec function enabled.
4- Writing permissions on this directory
   
When all the requerimients are fullfilled, you will be able to enable
YUI compression on Autoptimize's config page.
