How would I get a group of @codes to go through my .html file and if it finds anything in @codes, it'll change it into lowercase?

Basically, I'm trying to rewrite my html tags that are all uppercase to all lowercase.. How close am I? 

my $file = "index.html";

my @codes = ("<P>", "<BR>", "UL"); # and many more

open(FILE, "> $file") or die "Oops: $!";
while(<FILE>);
if ($_ eq @words) {
$_ =~ s/@words/lc @word/g;
}
close(FILE);

[download]
Thanks.

In reply to substuting a whole file by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
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