[jQuery] jquery-1.2.6.min.js and mootools.v1.1.js not compatable

Hi All,
i have a problem with web page, i have 2 js files for tow topic
jquery-1.2.6.min.js
mootools.v1.1.js
those file are not compatable togeher, please if have any thing or any
problem could you advice me how can i use it?
Thanks