Jquery library reference problem in web pages using Master page in IE8.

I used Jquery in Master page and added Jquery reference. It worked fine in Firefox, but it did not work in IE. The problem occurred when visited a page in a sub folder and it looks like the page cannot find Jquery library referenced in master page. How can I add Jquery reference in order it will be visiable to all child pages at any level (of folders)? 
 
Thanks.
Not sure why it did not work in IE.
 
<head runat="server"> <link href="~/StyleSheets/oneColumn.css" rel="stylesheet" type="text/css" /> <script src="../Javascripts/jquery-1.4.2.js" type="text/javascript"></script> <script src="../Javascripts/Jquery_corner.js" type="text/javascript"></script> <script type="text/javascript"> $(function() { $('#header').corner(); $('#footer').corner(); //$('#contents').corner(); }); </script& ...