[Javascript] How can I include form values in a javascript window.open?

[garry taylor]

Hi,
	As a Javascript newbie, this has me stumped:

function MM_openBrWindow(theURL,winName,features) { //v2.0
   window.open(theURL,winName,features);
}

     <FORM name="main" METHOD="GET" 
Submit="MM_openBrWindow('inputuserdetails.cgi','CARDS','scrollbars=yes,resizable=
yes,width=640,height=600')">

it opens the appropriate window, with the right URL, but no query string 
is included with the URL for all the form values, like it would be if I 
simply used a non-javascript form 'ACTION'.

How can I include the query string taken from the form and pass it to 
inputuserdetails.cgi in the same way as you can with href in HTML or 
with ACTION in a form?

Thanks in advance

Garry

Answers to email address appreciated.