Get URL Parameters Using Javascript

function getURLParameters(name) { 

    name = name.replace(/[\[]/, "\\\[").replace(/[\]]/, "\\\]");

    var regexS= "[\\?&]" + name + "=([^&#]*)"; 

    var regex =new RegExp(regexS); 

    var results= regex.exec(window.location.href);

    if(results == null) {             return "";         }         else{                  return results[1];

        }  }  

The way that the function is used is fairly simple. Let's say you have the following URL:

http://www.foo.com/index.html?bob=123&frank=321&tom=213#top

You want to get the value from the frank parameter so you call the javascript function as follows:

var frank_param =getURLParameters( 'frank' );

Now if you look at the frank_param variable it contains the number 321. The query string was parsed by the regular expression and the value of the frank parameter was retrieved. The function is smart in a couple of ways. For example, if you have an anchor in your URL like our example URL above does (#top) the gup() function knows to stop before the # character. Also, if a requested parameter doesn't exist in the query string then an empty string is returned instead of a null.

This function has worked very well for my query string parsing needs and should work well for you.

                                                                                                                            -Courtesy http://www.netlobo.com