[jQuery] simple test if all checked BEGINNER

[jQuery] simple test if all checked BEGINNER


Hello I sucessfully implemented a test to see if all checkboxes are
checked:
$("form#form1").submit(function() {
    var anzahl = $("#form1 input:checked").length;
    if (anzahl=="7"){$("#all").show(500);}
    return false;
});
I think this can be done more elegant, because when the number of
checkboxes change, I have to change my code. Not sexy....
Thanks in advance
Thomas