function checkphone(param)
{
    var goodformat=true;
    Str = param;
    
    if (Str.length == 0) return (true);

    for (a = 0;  a < Str.length;  a++)
    {
      charac = Str.charAt(a);
      if ((charac < "0" || charac > "9") && charac != " " && charac != "-" )
          goodformat=false;
    }
    return (goodformat);
}