Passing variables through a string that already has variable in it

[michaelam1 webforumsuser@macromedia.com]

I'm trying to pass variables collected from a flash form through a string. When it adds these variables to the string it automatically puts a ? in the front of it. That's all good except there are already variables in the string that need to stay there. I just need to add new ones on to the end. Any ideas?

Here's an example of the code I'm using:

var sender = new LoadVars();

submit_pb.setClickHandler("submitForm");

function submitForm () {
// Assemble text field values into our LoadVars object.
sender.address = address_txt.text;
sender.fname = PID1_txt.text;
sender.lname = PID2_txt.text;
sender.zip = PID11_txt.text;
// Transfer the data to the server-side script.
sender.send("http://test.com/Survey/dspSurvey.cfm?N=13&SID=29&SEQ=2", "_Blank", "GET");
}

I have to have the ?N=13&SID=29&SEQ=2 in the string first.

Thanks for the help!