function shiftSubDiv(n)
{
  var el = document.getElementById('subDiv'+n);

  if ( el.style.display == 'none' )
    el.style.display = 'block'
  else
    if ( el.style.display == 'block' )
    el.style.display = 'none';
};

//------------------------------------------

function checkPhoneNmbr(inputS)
  {
    var sample = '0123456789';
    var outputS = '';
    var c;

    for ( i=0; i<inputS.length; i++ )
    {
      c = inputS.substr(i,1);

      if ( sample.indexOf(c)>=0 )
        outputS = outputS + c;
    };

    return(outputS);
  };