Function To Check If Quantity Ordered Is Valid

Nov 18, 2009

I have an online shopping cart and some of the products are sold in boxes of 6. So I am trying to write some code that will alert the customer if they have entered a quantity that isn't some multiple of six.

I've tried using the modulus operator as well as dividing by 6 and then checking to see if the result is a whole number but inevitably the alert box pops up no matter what I enter.

This is what I'm trying to use now:

Is there a better way to check if the entered quantity is a multiple of 6?

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<head> Code
<!---sPIN BUTTONS TO UP QUANTITY--->
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[Code]

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