Unable to start using JQuery with IBM RAD 7.5.5

Unable to start using JQuery with IBM RAD 7.5.5

Hi,
 
I have been using JQuery from last 1 year with IBM RAD 7.0 as IDE and WebSphere 6.1 as app Server without any problem.
Now my development environment is upgraded wtih IBM RAD 7.5 and WebSphere 7.0 server.
 
After writing the code in jsp within <JavaScript> tags as
 
<
script type = "text/javascript" >
$(document).ready( function(){
{);
</script>
 
i am getting the following error.
The function $(HTMLDocument) is undefined
 
I have included jquery-1.4.2.min.js and even replaced with jquery.min.js.
But there is no use.
 
please help how to get resolve this issue.
 
Thanks,
Srinivas