mysterious blank space in variable

[Cool Hand Luke]

Ahoy, hoy.
I am having problems with this script, it keeps adding 6 blank spaces in
front of a variable when it calculates it. I can't see why it's doing so.
The variable in question is the $x_amount. Can anybody see where I'm going
wrong, or alternately is there a quick way to strip a variable down to just
numbers and "."s? Just one line I could add maybe at the end that would
strip it of these 6 blank spaces?
Any help is appreciated.
Thanks,
Luke

 if ($FORM::F_totalsum) {
    @sumvars=split(/,/,$FORM::F_totalsum);
    $x_amount=0;
    foreach $i (@sumvars) {
      if ($i eq "F_subtotal") {
 $x_amount+=$subtotal;
      } elsif ($i eq "F_tax") {
 $x_amount+=$tax;
      } elsif ($var_set{$i}) {
 $x_amount+=$req->param($i);
      } else {
 &err("$i is not defined");
      }
    }
    $x_amount=&currency($x_amount);
  }


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