how to detect killed popup window

[scorpioy]

If the browser installs popup killer, sometimes necessary popup window will be killed too, some websites can detect this and ask the user to click again by pressing ctrl key. But how could we implement it in PHP?

Thanks

[Roger_Ramjet]

by using javascript. php is server-side and knows nothing about events on the client. go to http://javascriptkit.com/ or similar javascript resource and search for what you need.