@konithomimoFeb 07.2007 — #Well, the basic answer is yes. You can have an alert popup if a URL is typed in, but what you can do with the URL is limited. If you are talking about checking if a user types a URL into a textbox or textarea, then it is easy enough, which is what a lot of people do to prevent users from sending links in PMs, since people can get data from cookies that way.