I have a problem with decimal numbers

And you have the newest version of MMF2? build 248? A lot of extensions only work with a recent (not necessarily newest, but recent) build.

I'm pretty sure he's just asking how to convert decimals to integers. In many countries a comma is used instead of a decimal point. (http://en.wikipedia.org/wiki/Decimal_separator)

daniele - Try DavidN's suggestion. Put Floor() around your expression. Which will round the number down.

For example:
Floor(1.98) = 1
Floor(13.46) = 13