function LayerShow(id)
{
	document.getElementById(id).style.display = 'block';
}

function LayerHide(id)
{
	document.getElementById(id).style.display = 'none';
}

function btn_enable(id)
{
	document.getElementById(id).disabled = false;
}

function btn_disable(id)
{
	document.getElementById(id).disabled = true;
}

function testKey(e) //возвращает тока цифры
{
  var key = (typeof e.charCode == 'undefined' ? e.keyCode : e.charCode);

  // Ignore special keys
  if (e.ctrlKey || e.altKey || key < 32)  return true;

  if ((key >= 48) && (key<=57)) {
    key = String.fromCharCode(key);
    return key;
  } else {
    return false;
  }
  
}