Variable info from file in template

Hello,

Maybe this is the biggest newbie question but I cannot solve it searching the manual and forum. Thanks for your help/suggestions.

I have a MySQL-table with fields like number_NL, number_UK, number_DE. Depending on the site people are responding from, I need to show the info from The Netherlands (NL), United Kingdom (UK), etc.
The info from which site they come is in a php-file with the variable $sc.

I want in my HTML the field [blk1.number_[var.sc]] in such a way that the [var.sc] is replaced by NL, UK or DE. Obviously this does not work, but what do I have to code?

Thanks a lot!
Rob

Problem solved with [onload.sc]