I need the ability to do more than just use regexp validation on product options. For example I have an option that isn't relevant unless another option has a particular value. I need to disable the 'optional' option and enable it when the partent option has the proper value. I also need to be able to send a JavaScript alert to the user based on certain combinations of options. Are there any add-ons that anyone knows of that allow the creation of custom JavaScript for product options?
[font=tahoma,geneva,sans-serif]Sounds like a good idea - “Conditional Product Option”! 
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[font=tahoma,geneva,sans-serif]Contact ‘tbirnseth’ through the forums or visit his website. If available, he will be able to either point you in the right direction, to get you started, or, provide a quote for the custom work (recommended).[/font]
[font=tahoma,geneva,sans-serif]You could also try posting your requested modifications here : [url=“Developers' Corner - CS-Cart and Multi-Vendor Community Forums | Connect with the Community | Find Solutions”]Developers' Corner - CS-Cart and Multi-Vendor Community Forums | Connect with the Community | Find Solutions and detail in point form what changes / additions you require.[/font]
[font=tahoma,geneva,sans-serif]There are plenty of other developers on the forums, which you can contact, but I can only assume these changes would take some time.[/font]
[font=tahoma,geneva,sans-serif]Good luck.[/font]