[jQuery] simple test if all checked BEGINNER

[tlob]

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