Ahh, I see what you mean.
I'm afraid not... Someone asked about this a while back, and I posted some code that could be used - however you'd have to modify the Web IDE to add a block: http://forum.espruino.com/conversations/1536/#comment26339
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Ahh, I see what you mean.
I'm afraid not... Someone asked about this a while back, and I posted some code that could be used - however you'd have to modify the Web IDE to add a block: http://forum.espruino.com/conversations/1536/#comment26339