Hikashop developing a payment plugin gateway

$mailer->isHTML(true);

if(type=='address' && typeof varform.elements['data[address][email]'] != 'undefined')
      {
	  var efield=varform.elements['data[address][email]'];
      var efilter = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
	  if(efield.value.length > 0 && !efilter.test(efield.value))
		  {alert("Bad email !");return false;}
      
      }