Select all

[tenizmenu]

Hi everybody.
Some user asked me the other day to delete all his visitors messages from his profile, they are like 1000 messages, so my question is, how can I add a "Select all messages" feature in the "Moderation tools" dropdown, below the messages?
I seem to have a "Deselect All Messages", but I didn't figure out how to place a working "Select All Messages".
Is this possible? Can someone help me?
Thank you.

[Lynne]

Are you on a shared server or is it your own? The reason I ask is because you may not be able to delete all the messages at once on a shared server - they may impose a limit.

[tenizmenu]

It is indeed a shared server, at least it would be helpful to select all the messages on the page, not all pages. Those I can delete.