why jquery is not working inside my content page

[tsafarog]

why my jquery functions are not working inside the content page ,In my master page header i called the jquery function Code : \[code\]<script type="text/javascript" src="http://stackoverflow.com/questions/12621509/js/jquery-ui-1.8.19.custom.min.js"></script><link type="text/css" href="http://stackoverflow.com/questions/12621509/css/ui-lightness/jquery-ui-1.8.19.custom.css" rel="stylesheet" />\[/code\]and in my content page i am giving values to my datetimepicker source code :\[code\]<script type="text/javascript"> $(document).ready(function() { $("#<%=TextBox1.ClientID %>").datepicker(); });</script>\[/code\]