the theme causes a javascript error

I have version 1.5 and I cannot update because I have made some css and php changes. But I didnt touched any javascript. Can you please help me fix that?
September 26, 2013, 11:54pm
Hi, this is in ,.templates/header.php betwen Jquery functions. It is indicating error in serach input field in search box area. The autocomplete automatically fills the search field with string matching the search characters. Probably this is made by the php changes what you made, because normally this problem is not presists in this template. Try to back-up the changes what you made and update the theme.
September 27, 2013, 10:43am