var na_fields = {
  'cu_firstname':{'l':Label_31,'r':true, 'f':'alpha'},
  'cu_lastname':{'l':Label_32,'r':true,'f':'alpha'},
  'cu_email':{'l':Label_33,'r':true, 'f':'email'},
  'cu_message':{'l':Label_35,'r':true, 'f':'alphanum'}
  };


var form_4 = new validator('contact_form', na_fields, o_config);
Forms['contact_form']       = form_4;

function checkCUForm(){

  if(Forms['contact_form'].exec()){

 return true;
  }
  else return false;
}