/ Published in: JavaScript
This code actually opens up another tab (rather than a pop up) in IE6 & IE7 - but if you can live with that it seems to work well in all modern browsers. I'm open to any additions/revisions that anyone finds appropriate. Props to the URL above for providing the pop up function. I use PHP in this case to supply the URL to be shared - feel free to replace with a static url or whatever you need.
URL: http://javascript.internet.com/generators/popup-window.html