When you say "Field Name" is this the DB field you're talking about?

Also, does the "100" at the end of this string mean that it sets how many characters are in the subject body at the top or how many they can put in that will be shown in the inbox link?
$sText = strmaxtextlen($r['subject'], 100);
So if I put $sText = strmaxtextlen($r['subject'], 30);