The only way you can pull that off is by forking your scripts. Otherwise they will hang the calling script.

Of course there are terminal issues, so make sure all the scripts are run in the background, otherwise there is only one script that can print. Also mind you the buffering of your OS.

It is probably better to keep it all in one script.

Cheers,

Jeroen

PS: You can use simple HTML tags and the CODE tag in your posts.