<html>
<head>
<script type="text/javascript">
function id( el ){
return document.getElementById( el );
}
window.onload = function()
{
var inputs = id('f-teste').getElementsByTagName('input');
var result = '';
for( var i=0; i<inputs.length; i++ )
{
if( inputs[i].name=='id_cod[]' )
result += 'name: '+inputs[i].name+' value: '+inputs[i].value+'<br />';
}
id('result').innerHTML = result;
}
</script>
</head>
<body>
<form action="" method="post" id="f-teste">
<input type="hidden" name="id_cod[]" value="1" />
<input type="text" name="produto[]" value="Um" />
<input type="hidden" name="id_cod[]" value="5" />
<input type="text" name="produto[]" value="Dois" />
<input type="hidden" name="id_cod[]" value="15" />
<input type="hidden" name="id_cod[]" value="7" />
<input type="submit" name="ok" value="ok" />
</form>
<div id="result"></div>
</body>
</html>