Hi, I have the following function which limits the amount of characters you can enter into a text area.

What's meant to happen is, if the text length is higher than the text limit, set an attribute of disabled="disabled" on the submit button, but it isn't getting set, my function code is as follows:

function limitChars(textid, limit, infodiv) {
        var text = $('#'+textid).val(); 
        var textlength = text.length;
        if(textlength > limit) {
            $('#' + infodiv).html('You cannot write more then '+limit+' characters!');
            $('input#submit').attr('disabled', 'disabled');

        } else {
            $('#' + infodiv).html('You have '+ (limit - textlength) +' characters left.');

        }
    }

Any ideas?