Why do you think that a javascript variable named mysample and a form input named mysample are related? How about something like this:

function setval(varval)
{
    mysample= varval;
    var inputs = document.getElementsByName("mysample");
    inputs[0].value = mysample;
    alert(mysample);
}
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...there are probably more robust ways of achieving what you want, though. Modifying a bit poj's form sample, we can do this:

<form action="test.cgi" method="post">
<input type="submit" name="action-add" value="Add"/>
<input type="submit" name="action-edit" value="Edit"/>
<input type="submit" name="action-delete" value="Delete"/>
<input type="hidden" name="hide" value="123"/>
</form>

...
if ($cgi->param('action-add')) {
    # do something
    ...
} elsif ($cgi->param('action-edit')) {
    ... etc
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