Jquery+Javascript for Checkbox Behaves like radio Button

 $(function () {
        $('#<%=chkRepoAccRights.ClientID %> :checkbox').click(function () {
            var selectedIndex = $('#<%=chkRepoAccRights.ClientID %> :checkbox').index($(this));
            var chkRepoAccRights = document.getElementById('<%=chkRepoAccRights.ClientID %>');
            var chkRepoAccRightsCount = chkRepoAccRights.getElementsByTagName("input");
            for (i = 0; i < chkRepoAccRightsCount.length; i++)
                    chkRepoAccRightsCount[i].checked = false;
            chkRepoAccRightsCount[selectedIndex].checked = true;
        });
    });