Select all checkbox in a div or in grid

<script language="javascript" type="text/javascript">
function SelectAllCheckboxes(spanChk) {         
            var collection = document.getElementById(‘GridData’).getElementsByTagName(‘INPUT’);
            for (var x = 0; x < collection.length; x++) {
                if (collection[x].type.toUpperCase() == ‘CHECKBOX’)
                    collection[x].checked = spanChk.checked;
            }
        }
    </script>

            <input id="chkAll"  runat="server" onclick="javascript:SelectAllCheckboxes(this);"
                type="checkbox" />     
            <b>Select All </b>

        <div class="innerrightarea" id="GridData">
            <input type="checkbox">
            <input type="checkbox">
            <input type="checkbox">
            <input type="checkbox">
            <input type="checkbox">
        </div>

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