var isNN = navigator.appName.indexOf("Netscape") != -1;
var doneLogin = 0;

function convertSize(size, kind) {
    if(is.win32) {
        if(is.ns6up && kind=="input") size = size * 0.68;
        else if(is.ns6up && kind=="cols") size = size * 1;
        else if(is.ns4) size = size * 0.6;
    }
    else if(is.mac) {
        if(is.ns6up) size = size * 0.9;
        else if (is.ns4 && kind=="input") size = size * 1.1;
        else if (is.ns4 && kind=="cols") size = size * 0.9;
        else if (is.ie4up && !is.ie5up && kind=="input") size = size * 0.6;
        else if (is.ie4up && !is.ie5up && kind=="cols") size = size * 0.6;
        else if (is.ie5up && kind=="input") size = size * 0.85 + 1;
        else if (is.ie5up && kind=="cols") size = size * 0.8;
    }
    size = Math.round(size);
    if(size < 1 || isNaN(size)) size = 1;
    return size;
}

function writeAutoTabInput(name, size, maxlength, value, clas) {
    size = convertSize(size, "input");
    var props = ' name="' + name + '" size="' + size + '" maxlength="' + maxlength + '"' + ((value) ? ' value="' + value + '"' : '') + ((clas) ? ' class="' + clas + '"' : '');
    var doc = document;
    doc.writeln('<input type="text" onKeyUp="return autoTab(this, ' + maxlength + ', event);" ' + props + '>');
}

function autoTab(input, len, e) {
    var keyCode = (isNN) ? e.which : e.keyCode;
    var filter = (isNN) ? [0,8,9] : [0,8,9,16,17,18,37,38,39,40,46];
    if(input.value.length >= len && !containsElement(filter, keyCode)) {
        input.value = input.value.slice(0, len);
        input.form[(getIndex(input) + 1) % input.form.length].focus();
    }

    function containsElement(arr, ele) {
        var found = false, index = 0;
        while(!found && index < arr.length) {
            if(arr[index] == ele) {
                found = true;
            }
            else {
                index++;
            }
        }
        return found;
    }

    function getIndex(input) {
        var index = -1, i = 0, found = false;
        while(i < input.form.length && index == -1) {
            if(input.form[i] == input) {
                index = i;
            }
            else {
                i++;
            }
        }
        return index;
    }
    return true;
}

function doLogin() {
    if(doneLogin == 0) {
        doneLogin = 1;
        return true;
    }
    else {
        return "";
    }
}