"<form name='mySelectionForm' action='admin.php' method='post' enctype='multipart/form-data'>
<input type=\'button\' value=\'Previous_Month\' onClick=\'location.href='admin.php' \'>
<input type='hidden' name='date3' value=''$previousfirstday'' />
<input type='hidden' name='date4' value=''$previouslastday'' />
</form>";