Please Help! Trouble with Alert blocks...

Hi guys, I’m A Flowlab “Expert”, And i just can’t get it working.
I’m trying to re-make the game “ClickHead”, and i want to make it so when you click on the block that says “PLAY!!” it makes this alert pop-up, but when it shows the alert it doesnt let me click… here’s the game: http://flowlab.io/game/view/1289081
Please let me know what iv’e done wrong…

http://forum.flowlab.io/discussion/7866/trouble-with-alert-blocks#latest