JavaScript Decimal Place Restriction With RegEx

Question

I have some client-side validation against a text box, which only allows numbers up to two decimal places with no other input.

This script was a basis for entering n

Answer 1

gs: This is very close, but the line

f.value = f.value.replace(/[^\d\.]/g, "");

Doesn't actually appear to work. In fact I lose focus of the text box for some reason. Although perhaps it's my code ;)