drag drop - help needed

hi,

ran into the following problem. Have two circles in which users need to sort numbers. One circle should accept multiplies of number 6, the other should accept multiplies of number 9. All numbers that need to be dragged are  visible on the screen. Wrongly dragged numbers should return to original position.

The tricky part comes with number 18 - which is right choice for both circles (therefore there are two of them on screen). However - if first 18 is dragged into left circle, then dragging the second one into the same circle should not be accepted as correct answer and 18 should be returned to original position.

Oh and output should be HTML5 compatible.

thanks for your ideas and help

sebastjan

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