change url of already opened popup

var w1 = window.open('http://www.canop.org','wind1');

w1.location.href='http://www.google.com';

in the new popup window use this :

$(document).ready(function(){ window.parent.location="http://www.google.com" })

For me, as I was changing just the end of the url (parameters part), I used a little trick: Loading a different url before using the new similar url. I chose to use 'about:blank', but any website url could be used.

self.location = "about:blank";
self.location = desired_url;

//this code works fine both in Mozilla Firefox as in Chrome

Notice that just location = site; does the same as location.href = site.
I use location.href only to READ the current url.