function validateUSPhone( strValue ) {
/************************************************
DESCRIPTION: Validates that a string contains valid
  US phone pattern. 
  Ex. (999) 999-9999 or (999)999-9999
  
PARAMETERS:
   strValue - String to be tested for validity
   
RETURNS:
   True if valid, otherwise false.
*************************************************/
  var objRegExp  = /^[1-9]\d{2}\-\d{3}\-\d{4}$/;
 
  //check for valid us phone with or without space between 
  //area code
  return objRegExp.test(strValue); 
}