function trim(str, chars) {
  return ltrim(rtrim(str, chars), chars);
}

function ltrim(str, chars) {
  chars = chars || "\\s";
  return str.replace(new RegExp("^[" + chars + "]+", "g"), "");
}

function rtrim(str, chars) {
 chars = chars || "\\s";
 return str.replace(new RegExp("[" + chars + "]+$", "g"), "");
}

function recFocus(e,s) {
  if( e.value == s) e.value = '';
}

function recUnFocus(e,s) {
    if( trim(e.value) == '') e.value = s;
}