Changing Text : greasemonkey -- Newbie

Question

Hi Geeks ,

I have a web page wich loads with the following code :

    <script src="library/js/index.php" type="text/javascript"></script>
    <script src="library/js/function.js" type="text/javascript"></script>
    <script src="library/js/template.js" type="text/javascript"></script>
    <script src="library/js/soundmanager.js" type="text/javascript"></script>
    <script src="library/js/display.js" type="text/javascript"></script>

These files are loaded when the page is accessed .

The file library/js/display.js contains some code like this :

var casekweryCaseLink = 'case/getServiceRequest.do?header=N&status=I&view=D&id=';

I would like to change the url here to 'CQuery/?srno='

Any pointers to this would be very helpfull . I am not aware of programming in JavaScript a lot .

Thanks for your help