Random sounds with pause inbetween

1

is it possible to have random sounds play… BUT with a 15 or 30 second pause between the sounds?(interval) I have the following script to play the sounds which works but theres no pause between sounds… thanks

onLoad = function () { _global.i = random(3)+1;_root.MTMC.attachMovie("song"+_global.i, "newsong", 1);};