$(function(){
		$("#iletisim select option").click(function(){
			var index = $(this).index();
			    alert(index);
		});
});

<form action="#" id="iletisim" method="post">
   <select name="konu">
      <option value="bos" selected="selected">Konu Seçiniz...</option>
      <option value="a">A</option>
      <option value="b">B</option>
      <option value="c">C</option>
   </select> 
</form>