The pattern I posted will only return true for a dot if it has one or more numeric digits after it. Make sure you're actually trying what I posted.

Mmm, yeah. Being called ignorant. That always makes me want to work with people.

Try if(!form1.paid.value.match(/^(\d+|\d*\.(\d+))$/)).

That'll do it. Don't forget to mark the thread solved. :)

If your customer hunts you down and shoots you after receiving the first increment, you don't get to write future increments.

Just, y'know, random feedback... the big Iron Cross helmet guy doesn't really give me that good grognard strategy-gamer feeling so much as that icky wrong-side-of-World-Wars feeling.