function validate_email(form_name,em_fld){
 if(em_fld=="") em_fld="email";
 var email=eval('document.'+form_name+'.'+em_fld);
 var reg = new RegExp("[0-9a-z_]+@[0-9a-z_^.]+\\.[a-z]", 'i');
 if (!reg.test(email.value)) {alert('E-mail введен некорректно'); return false;}
 else return true;
}