Unfortunately most of these questions go beyond MediaLab and are really HTML and JAVA questions. I do think you could add some validation code to the form post section though to ensure they have moved the slider. It's just not something I'm especially great at coding. There may be an example worth looking at here:

http://www.empirisoft.com/support/showthread.php?t=222

Also, feel free to post any new techniques you discover on the sharing board:

http://www.empirisoft.com/support/forumdisplay.php?f=25