Internet Explorer

To disable pop-up blocker in Internet Explorer, go to Tools >>>> Pop-up Blocker >>>> Turn Off Pop-up Blocker. After the chat session is over, please remember to turn your pop-up blocker back on.

Firefox

To disable pop-up blocker in Firefox, go to Tools >>>> Options. Once the Options window is open, as indicated to the left, click on Web Features. Next, UN-Check the Block Popup Windows Box. Click OK at the bottom to accept the changes. After the chat session is over, please remember to turn your pop-up blocker back on

Opera

To disable pop-up blocker in Opera, go to Tools >>>> Quick Preferences>>>> Open all pop-ups. After the chat session is over, please remember to turn your pop-up blocker back on
Mozilla

To disable pop-up blocker in Mozilla, go to Edit>>>> Preferences. Once the Preferences window is open, as indicated to the left, click on Privacy & Security. Next, click on Popup Windows. Next, UN-Check the Block Unrequested Popup Windows Box. Click OK at the bottom to accept the changes. After the chat session is over, please remember to turn your pop-up blocker back on.
Google toolbar

To disable pop-up blocker from the Google Toolbar, click on Options Once the Toolbar Options window is open, UN-Check the Popup Blocker Box. Click OK at the bottom to accept the changes. After the chat session is over, please remember to turn your pop-up blocker back on.
Yahoo toolbar

To disable pop-up blocker from the Yahoo Toolbar, Click on the small picture of a window with a shield. Click on Enable Pop-Up Blocker to uncheck this option. After the chat session is over, please remember to turn your pop-up blocker back on.

This page courtesy http://chat.ohiolink.edu/popups.html