<script language="JavaScript">
function unselectall(){
if(document.myform.chkAll.checked){
document.myform.chkAll.checked = document.myform.chkAll.checked&0;
}
}
function CheckAll(form){
for (var i=0;i<form.elements.length;i++){
var e = form.elements[i];
if (e.Name != "")
e.checked = form.chkAll.checked;
}
}
</script>
关键是form的问题,那你需要全选的复选框,放到一个form 里面就可以了