Need some help with working with Javascript Regex

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Javascript

Using the following to load images base on two ids one is the and bookid and the out is the client.
My folder structures is this.
root path = flipbooks

subfolders under flipbooks are books and clients

in subfolder books I have and .net page title tablet.

the tablet code behind checks the bookid of client and render a the tablet page with images in a flipbook fashion.

because we have over 15000 records and flipbooks already created and stored in the database. I don't move the client folder under the books subfolders. I need the code below to get to the client subfolder in the query string and help to change this would be helpful.

The result now is http://www.somewebsite.com/books/client/images/someimage1.jpg[^]
I need the results to be http://www.somewebsite.com/client/images/someimage1.jpg[^].

I tried moving the tablet.aspx file to the root flipbooks and it works but i have provide a user name and password each time. This need to be access by the public and my root is protected. Don't want to have to change permission.

//function getParameterByName(name) {
//    name = name.replace(/[[]/, "\\\[").replace(/[\]]/, "\\\]");
//    var regexS = "[\\?&]" + name + "=([^�]*)";
//    var regex = new RegExp(regexS);
//    var results = regex.exec(window.location.search);
//    if (results == null) {
//        return "";
//    }
//    else {
//        return decodeURIComponent(results[1].replace(/\+/g, " "));
//    }
//}

Change the code to

function getParameterByName(name) {

    var results = RegExp('[?&]' + name + '=([^&]*)')
                    .exec(window.location.search);

    return results ?
        decodeURIComponent(results[1].replace(/\+/g, ' '))
        : null;

}

Thanks Mission Critical