Need device to show when window is in motion...

Anyone know of a device (preferably zwave) that would sense when a window is being opened or closed. It's summertime now and we like to keep the windows open but not all the way. Would like a notification if the window is moved either up or down.

I found one device (http://board.homeseer.com/showthread.php?t=181967) that would do it but it's not available yet, hopefully next month. But in the meantime would love to hear if anyone else has solved this problem.

Thanks