<script>
var all = document.getElementById("j_cbAll");
var tbody = document.getElementById("j_tb");
var checkboxs = tbody.getElementsByTagName("input");
all.onclick = function() {
for (var i = 0; i < checkboxs.length; i++) {
var checkbox = checkboxs[i];
checkbox.checked = this.checked;
}
};
for (var i = 0; i < checkboxs.length; i++) {
checkboxs[i].onclick = function() {
var isCheckedAll = true;
for (var i = 0; i < checkboxs.length; i++) {
if (!checkboxs[i].checked) {
isCheckedAll = false;
break;
}
}
all.checked = isCheckedAll;
};
}</script>
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