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<form name="Form1" method="post" action="default.aspx" id="Form1">
<input type="hidden" name="__VIEWSTATE" value="dDwtM" />
...
<input name="tbPassword" type="password" size="14" id="tbPassword" />
<input type="image" name="btLogin" id="btLogin" src="/vr/images/bt_ent
+er.jpg" alt="" style="border-width:0px;border-style:None;" />
</form>

my $response = $browser->post( $url,
    [ 'tbLogin' => 'value',
...
      '__VIEWSTATE' => 'value',
    ]
);