// 全選,通過復選框操作
//checkid列表復選框name

<input type="checkbox" name="checkall" value="1"? onclick="CheckAll()">

<input type="checkbox" name="checkid" class="checkbox1" value="">

function CheckAll()
{
? for (var i=0;i<document.getElementsByName("checkid").length;i++)
?{
? var e = document.getElementsByName("checkid")[i];
??? if (e.name != "checkall") {
?????? e.checked = document.all.checkall.checked;
??? }
? }
}