call source $file=...;$html_safe=...;$nl2br=...;$space2nbsp=...

$file=Location of file
(source uses relative addresses only not http://)
$html_safe=0;  Do not convert reserved characters.
The html in the file is parsed. Xt: functions variables and php are  not  parsed
$html_safe=1; Convert reserved characters to their html entity equivalents.
The html in the file is shown as text
$nl2br=1; Convert all newlines in the output to <br /> html tags
$space2nbsp=1; Convert spaces in the output to non-breaking spaces (&nbsp;)