UNIX for Dummies Questions & Answers

Hi,
I have two files. File1.txt has 2 columns and looks like:
458739 122345
4456 122657
34200 122600

File2.txt has many columns with column 1 the same as column2 of File1.txt, but with lot more rows:

122786 abcdefg user1@email
122778 uuhjeufh user2@email
122345 lljwedwef user3@email
122600 eroewrwj user4@email
. . .
. . .
. . .
129999 werwerwr usern@email

I want to find the common numbers between column2 of File1.txt and column1 of File2.txt and output the columns 2 and 3 of File2.txt to a new file.

Can someone help me out please?

Code:

awk 'FILENAME=="File1.txt" {arr[$2]++}
      FILENAME=="File2.txt"  {if ($1 in arr) {print $2, $3} ' File1.txt  File2.txt > newfile