function textCounter(textFrom, textMess, textCount) {

    var txtFrom = document.getElementById(textFrom);
    var txtMess = document.getElementById(textMess);
    var txtCount = document.getElementById(textCount); 

    if (txtFrom.value.length > 0)
        txtCount.value = 140 - (txtFrom.value.length + txtMess.value.length + 6);
    else
        txtCount.value = 140 - txtMess.value.length;

    if (txtCount.value < 0) field.value = field.value.substring(0, 140);
}