passing vars between windows

Please help ma to solve this problem with Mozilla…
A have a code which works fine in IE and don’t work in Mozilla.
My code has to pass variables from window to window.
On the first window the code runs like tgis

function UserID(url) {
srchString = "T209753d1";
url += "?" + escape(srchString);
location.href = url;
}

On the second window I have this snippet to read data from the first window

function readData( ) {
var srchString = unescape(location.search.substring(1, location.search.length));
document.forms[0].hiddenfield.value= srchString;
}

What should be done in order that this code works also for Mozilla?
Thank you very much…..

Try document.location or window.location

Thank you Willy.
I figured it out.....
All I had to do is to clear cache....