Safari's Pop-up Blocker is integrated into the browser, much like the Pop-up Blocker for Internet Explorer. To disable the Pop-up Blocker:
Open the Safari menu and select the Preferences option.
In the window that displays, click on the Security option.
Remove the checkmark from the Block pop-up windows option.
Close the window.
Or, for another version of Safari, try:
Open Safari.
Click on the Safari Menu.
Uncheck Block Pop-Up Windows.
Once you are finished, you can go back into the menu again to turn on the Pop-up Blocker.