function getObject(obj) {
    if(document.all) {
        if(typeof obj=="string") {
            return document.all(obj);
        } else {
            return obj.style;
        }
    }
    if(document.getElementById) {
        if(typeof obj=="string") {
            return document.getElementById(obj);
        } else {
            return obj.style;
        }
    }
    return null;
}

function toCount(entrance, exit, text, characters) {
    var entranceObj = getObject(entrance);
    var exitObj = getObject(exit);
    var length = characters - entranceObj.value.length;
    if(length <= 0) {
        length = 0;
        text = '<span class="disable"> ' + text + ' </span>';
        entranceObj.value = entranceObj.value.substr(0, characters);
    }
    exitObj.innerHTML = text.replace("{CHAR}", length);
}