How to pass a parameter to a javascript through a url and display it on a page?

Question

For instance, I have a url like this : www.mysite.com/my_app.html

How do I pass a value \" Use_Id = abc \" to it and use javascript to display on that page ?

Answer 1

www.mysite.com/my_app.html?Use_Id=abc


var querystring = window.location.querystring;
var myValue = querystring["Use_Id"];

UPDATE: Link to library (thanks @Andy E), http://prettycode.org/2009/04/21/javascript-query-string/