I am a member on another forum (monsterfishkeepers) When you get a PM (at least with mozilla and windows XP) on the bottom right of your computer, you get a pop up about 3x3 inches saying you have a message, you click it and it shows you it. Their forum looks very similar to this 1, so im sure its not hard to do? They also hit you with a mid screen pop up when you go to their site (incase you missed the bottom one) I have gone a few times without noticing on here.
Its very similar to what AOL mail does for the bottom right pop up.
Its very similar to what AOL mail does for the bottom right pop up.