Add n number of characters to Element text

VB had a function for this called String(char, n).
Called like this, String("0", 2) would return "00"
I am not sure what the Java analog is.

For Example:
  <FOO>1</FOO> ===>>> <FOO>01</FOO>
  <FOO>2</FOO> ===>>> <FOO>02</FOO>
  <FOO>10</FOO> ===>>> <FOO>10</FOO>

Could I do something like this
<xsl:template match="FOO">
  string("0", 2-length(<xsl:value-of select="."/>))<xsl:value-of select="."/>
</xsl:template>

Ross Cormier
Structure Consulting Group L.L.C
225-772-4973