Deleting Messages - how to select all but exclude a few messages from deletion

Does Facebook have a 'Check All' function when deleting messages? I'm asking because I want to delete all but few, select messages in my inbox. I haven't been able to find a 'Check all' or 'Select all' function (like in Gmail or Yahoo mail) that will make it easy to do this. Is there a Facebook function that I haven't been able to find or a javascript/greasemonkey script, extension or other software that can do this?

Yup do you have the new facebook or the old facebook message (inbox)?

Poke wrote:Yup do you have the new facebook or the old facebook message (inbox)?

I believe I have the new Facebook messaging UI as Facebook kinda forced this upgrade on everyone. Do you know how to have a "check all" or "select all" messages function with this?

Okay so go to ur inbox and click on the box thing and then you can select there and before i think u press achive. Im on my ipod touch so i forgot sorta. Umm i will give u a screen shot later in the day.