Now you can click these thumnails and if so, up pops a specified sized window (details.php) with a bigger version image of that product plus a few details.

The flaw would allow a phishing attack in which a malicious JavaScript pop-up window appeared in front of a trusted Web site, Secunia said in an alert published Tuesday in the US.

A final type of pop-up window comes from spyware installed on your computer that is designed to trigger pop up ads and bogus warnings.