[jQuery] jQuery and jCorner problems ($ is not a function)

[ReynierPM]

Hi every:
I'm trying to use jCorner to get rounded effects in some of my DIV but 
when I run the page nothing happen and I get this error:

$ is not a function
 [Break on this error] $().ready(function(){\n

I've included jQuery and jCorner libraries as follow:
<script src="jquery.js" type="text/javascript"></script>
<script src="jcorner.js" type="text/javascript"></script>

And then my code is this:
<script type="text/javascript">
      $().ready(function(){
        $('#login').corner("bl");
        $('#container').corner();
      });
</script>

Where it fails? What's wrong?
Cheers and thanks in advance