<form action=1.php method=POST> .... <input type=submit> </form> .... <a href="12345.html">Ссылка</a>
<form id='form' action="1.php method=POST"> <input id='fild_1' type='hidden' value=''> <input type=submit> </form> .... <a href="12345.html" onclick="Submit_href(this.href);return false">Ссылка</a> <script type="text/javascript"> function Submit_href(a) { var b=document.getElementById('form'); b.document.getElementById('fild_1').value=a; b.submit(); alert(a) } </script>