<script>
function test1(str, callback) {alert(str);}
function test2() {alert("test2");}
</script>
<div id="ret_form_fields_seq">
      <select size=10 style="width:253px">
      <input type=button value="^" style="width:50px" onClick="test1(0, function(){alert(1);})">
      <input type=button value="v" style="width:50px">
      </select> </div>

<script>
function test1(str, callback) {alert(str); callback;}
function test2() {alert("test2");}
</script>
<div id="ret_form_fields_seq">
      <select size=10 style="width:253px">
      <input type=button value="^" style="width:50px" onClick="test1(0, function(){alert(1);})">
      <input type=button value="v" style="width:50px">
      </select> </div>