function trimString (str) {
  while (str.charAt(0) == ' ')  str = str.substring(1);
  while (str.charAt(str.length - 1) == ' ')  str = str.substring(0, str.length - 1);
  return str;
}

function isEmail(argvalue) {
 if(argvalue.length<1)return true;
 var regEmail = /^[\w-]+(?:\.[\w-]+)*@(?:[\w-]+\.)+[a-zA-Z]{2,7}$/;
 return regEmail.test (argvalue);
}

function isDigit (c){return ((c >= "0") && (c <= "9"))}
function isEmpty(str){return ((str == null) || (str.length == 0))}
function isInteger(s){var i;if(isEmpty(s))if(isInteger.arguments.length == 1) return false;else return (isInteger.arguments[1] == true);for (i = 0; i < s.length; i++){var c = s.charAt(i);if (!isDigit(c)) return false;}return true;}