but still i would have wanted to achieve it by clicking the button...anyways will keep trying...am sure object instantiation is creating problem somewhere...but unable to trace it

thanks for ur help monks...truly appreciated

That is impossible.
1. The html is broken (no form tags), which is why there is no default form, to be set as default, or for you to select (via $mech->form_name or $mech->form_number), and why $mech->click doesn't work. This is a bug in WWW::Mechanize, it should throw a useful error messages, example

use WWW::Mechanize;

$ua=WWW::Mechanize->new;
$ua->get('http://search.cpan.org');#got a form
warn $ua->forms;
warn $ua->submit;
$ua->get('http://cpan.org');#no forms here
warn $ua->forms;
warn $ua->submit; #dies here

__END__
HTML::Form=HASH(0x1d76ca0) at - line 6.
HTTP::Response=HASH(0x1d77114) at - line 7.
Warning: something's wrong at - line 9.
Can't call method "make_request" on an undefined value at D:/Perl/site
+/lib/WWW/Mechanize.pm line 1641.
[download]

2. Clicking the button calls javascript, which is not supported (see WWW::Mechanize::FAQ). Besides, the javascript only redirects to rebootinfo.cgi (and it does that with eval -- whoever wrote this should be shot).