$(document).ready(function() 
{
    $("#checkall").click(function() 
    {
        var checked_status = this.checked;

        $("input[@type=checkbox]").each(function() 
        {
            this.checked = checked_status;
        });
    });
});

function check_group(id) 
{
    $("#" + id + "_checkall").click(function() 
    {
        var checked_status = this.checked;

        $("input[@title=" + id + "_group]").each(function() 
        {
            this.checked = checked_status;
        });
    });
}