function replaceText(el, text) {
  if (el != null) {
    clearText(el);
    var newNode = document.createTextNode(text);
    el.appendChild(newNode);
  }
}

function clearText(el) {
  if (el != null) {
    if (el.childNodes) {
      for (var i = 0; i < el.childNodes.length; i++) {
        var childNode = el.childNodes[i];
        el.removeChild(childNode);
      }
    }
  }
}

function getText(el) {
  var text = "";
  if (el != null) {
    if (el.childNodes) {
      for (var i = 0; i < el.childNodes.length; i++) {
        var childNode = el.childNodes[i];
        if (childNode.nodeValue != null) {
          text = text + childNode.nodeValue;
        }
      }
    }
  }
  return text;
}

//установка указателей переключателей по тексту
jQuery.fn.check = function(mode) {
    var mode = mode || 'on';
    return this.each(function()
    {
        switch(mode) {
            case 'on':
                this.checked = true;
                break;
            case 'off':
                this.checked = false;
                break;
            case 'toggle':
                this.checked = !this.checked;
                break;
            }
    });
}