我有1個html
1個php
目前可以將
select 的 value 傳給 php(但是是透過 get 的方式)
請問要怎麼做
才能把 hidden 的 value(h1，h2，h3，h4)
一起傳到 php 呢(透過 onchange，而且不要用 get)

<script>
function chg()
{
	str_n = document.getElementById('n').value;
	str_m = document.getElementById('m').value;
	if(str_n)
	{
		document.getElementById("m").disabled = true;
		window.open("select_submit.php?a="+str_n);
		document.getElementById("m").disabled = false;
		document.getElementById("n").value = "";
	}
	else if(str_m)
	{
		document.getElementById("n").disabled = true;
		window.open("select_submit.php?a="+str_m);
		document.getElementById("n").disabled = false;
		document.getElementById("m").value = "";
	}
}
</script>

<meta http-equiv="Content-Type" content="text/html; charset=utf8" />
<title>

</title>

<form name="form1">
<select name="n" onchange="chg()">
<option value="n1">n1</option>
<option value="n2">n2</option>
<option value="n3">n3</option>
<option value="n4">n4</option>
</select>
<hr>
<select name="m" onchange="chg()">
<option value="m1">m1</option>
<option value="m2">m2</option>
<option value="m3">m3</option>
<option value="m4">m4</option>
</select>
<input type="hidden" name="h1" value="h1">
<input type="hidden" name="h2" value="h2">
<input type="hidden" name="h3" value="h3">
<input type="hidden" name="h4" value="h4">
<hr>
</form>








<?php
echo $_GET['a'];
?>