<head>
<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
function check(field,checkflag) {
if (checkflag == 1) {
for (i = 0; i < field.length; i++) {
field[i].checked = true;
}
}
else{
for (i = 0; i < field.length; i++) {
field[i].checked = false; }
}
}
// End -->
</script>
</head>
<body>
<form name="form" method="post" action="">
<input type="checkbox" name="list" value="1">
<input type="checkbox" name="list" value="2">
<input type="checkbox" name="list" value="3">
<input type=button value="全选" onClick="check(this.form.list,1)">
<input type=button value="取消全选" onClick="check(this.form.list,0)">
</body>