Hi tarunkhanna,

As other have noted, this hasn't anything to do with perl.

But since you're pretty close, try doing this:

#!/usr/bin/perl -w

use strict;
use warnings;
use CGI;

my $co    = new CGI;
my $color = 'red';

print $co->header;
print $co->start_html();
print $co->start_form;
print $co->radio_group(
        -name => 'color',
        -id   => 'color',
        -values => ['red','yellow','green'],
        -default => 'red',
        -onClick => "return select_color(this)"
    ).$co->p;
print $co->textarea(
    -id   => "textarea",
    -style=> "background-color:$color;
        color:blue",
);
print $co->end_form;
print $co->end_html;
print <<COLOR_SCRIPT;
<script language="JavaScript">
function select_color(rb_obj) {
    var color   = rb_obj.value;
    var ta_obj  = document.getElementById('textarea');
    ta_obj.style.background = color;
    return color;
}
</script>
COLOR_SCRIPT
[download]

Note that it passes "this" to the function select_color, so that the value will change with the color. The id of the text_area object is then looked up, and its style.background is assigned to the current color.

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