hi,

first time i click the sel_all checkbox all checkbox will change to checked,

then, i click sell_all checkbox twice again, it dose't work.

(browser: chrome 26.0)

here is the example code:

<script src="http://code.jquery.com/jquery-1.9.1.min.js"></script>

<script>

$(document).ready(function(){

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

$("input[type=checkbox]").attr("checked", $(this).is(":checked"));

});

});

</script>

<input type="checkbox" id="sel_all">select all<br>

<input type="checkbox">

<input type="checkbox">

<input type="checkbox">

<input type="checkbox">

<input type="checkbox">

i had changeed jquery-1.9.1.min.js to jquery-1.8.2.min.js, then it works well.