I created some templates like

small_template.tmpl

<table align="center">
<tr><td align="center">
<font style="font-size: 14pt; font-family: Arial; solid #CCC; padding:
+ 3px" color="blue">
<p>Please Select  an Item</p></font>
</td></tr>
</table>
[download]

and then read them into $html_output by

...
...
open (FILE, "<", "small_template.tmpl" );
    $html_output = join "", <FILE>;
close FILE;
...
...
[download]

This works great but if I wanted to display some values of variables (like , the selected item's name ) using the small_template.tmpl, it doesn't work.

Probably, I should have some subrotines to create the html code and then display that using the template. I think it will mix the logic and the html, but it seems inevitable. The best I can do is to have subroutines that create the html messages separated from the logic.