多选框全选功能

<script  language="javascript">

$(function(){

$("#checkAll").click(function () {

$("input[name='checkAll2']").each(function () {

if (this.checked) {

this.checked = false;

} else {

this.checked = true;

}

});

});

$("#checkAll2").click(function () {

$("input[name='checkAll1']").each(function () {

if (this.checked) {

this.checked = false;

} else {

this.checked = true;

}

});

});

})

</script>

<table>

<tr><td><input type="checkbox" name="checkAll1" id="checkAll1"></td></tr>

<tr><td><input type="checkbox" name="checkAll2" id="checkAll2"></td></tr>

</table>