[htmltmpl] TMPL_VAR inside a TMPL_VAR

[LDT <per...@ya...>]

I'm running into an error when trying to pass a TMPL_VAR inside a TMPL_VAR and have it be evaluated.  I've set global_vars = 1, so I was thinking that would help.  I've included the pieces of my program, template and output.  As you can see, most of the TMP_VARs are evaluated/passed, but the internal TMPL_VAR isn't (although it's also the same "bgcolor" variable used in the <tr> line, which I highlighted in bold below.  
 
Am I missing something, or am I trying to do something naughty? 
 
Within my main program:
 
#set up format parameter for data cells in summary report
my $cell_fmt = <<EOL
  align="right" 
  style="cursor:pointer;cursor:hand;" 
  title="Click to drill down"
  onmouseover="style.background='#CCCCFF';" 
  onmouseout ="style.background='<TMPL_VAR NAME=bgcolor>';">
EOL
;

#Pass parameters to template; print report
$tmpl_main->param(  cell_fmt   => $cell_fmt,
                    passdata   => \@loop_data);
print $tmpl_main->output();

Within my template:
 
<TMPL_LOOP NAME=passdata>
    <tr class=<TMPL_VAR NAME=trclass> bgcolor=<TMPL_VAR NAME=bgcolor>>
    <td <TMPL_VAR NAME=cell_fmt><TMPL_VAR NAME=col_cfte></td>


The relevant section of the results when I view the source of the page (after the "invalid argument" errors):
 
<tr class=normal bgcolor=#FFFFFF>
<td align="right" style="cursor:pointer;cursor:hand;" 
                  title="Click to drill down"
                  onmouseover="style.background='#CCCCFF';" 
                  onmouseout ="style.background='<TMPL_VAR NAME=bgcolor>';">
<font color=#000000>$12,345.67</td>




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