var inputs = document.admin.getElementsByTagName("input"); 这样试一下：
var inputs = document.forms["admin"].getElementsByTagName("input");
var inputs = document.forms["admin"].getElementsByTagName("input");
调试欢乐多
<html>
<head>
</head><script>
function init(){
lock(document.getElementById('chkLock'))
t=document.location.hash.replace('#','');
if(t=='')t=1;
switchTag('tag'+t,'content'+t);//这个方法不在页面上，无法进行修改
}
function lock(obj){
//var inputs = document.admin.getElementsByTagName("input");//注释掉
var inputs = document.getElementsByTagName("input");//换成这个
for(var i=0; i <inputs.length; i++){
if(inputs[i].type == "text" && inputs[i].name != "servername"){
inputs[i].disabled = !obj.checked;
}
}
}
window.onload = function(){
document.getElementById("chkLock").checked = true;
document.getElementById("chkLock").click();
}
</script>
//页面的格式进行了调整。加了table，tr等
<body onload="init()">
<table>
<tr>
<td width="44%" height="24" align="right">
IP地址：</td>
<td width="56%" align="left">
<input name="ip" type="text" id="ip" value="<?php echo $ip?>" onblur="check_ip(this.value)" /></td>
</tr>
<tr>
<td width="44%" height="24" align="right">
子网掩码：</td>
<td width="56%" align="left">
<input name="netmask" type="text" id="netmask" value="<?php echo $netmask?>" onblur="check_ip(this.value)" /></td>
</tr>
<tr>
<td width="44%" height="24" align="right">
默认网关：</td>
<td width="56%" align="left">
<input name="gateway" type="text" id="gateway" value="<?php echo $gateway?>" onblur="check_ip(this.value)" /></td>
</tr>
<tr>
<td height="24" align="right">
服务器别名：</td>
<td align="left">
<input name="servername" type="text" id="servername" value="<?php $servername = iconv('utf-8','gb2312',$servername); echo $servername;?>" /></td>
</tr>
</table>
<table width="87%" height="24" border="0" align="center" cellpadding="0" cellspacing="1">
<tr>
<td height="25" align="center">
<input name="tijiao" type="submit" class="btn" border="0" value="确 定">
<input type="checkbox" value="1" id="chkLock" onclick="lock(this)" name="chkLock" /><label
for="chkLock">手动设置</label>
</td>
</tr>
</table>
</body>
</html>