function check_email(text)

{

	var reg = /.+@+.+\.+.+/;
	if(!reg.test(text))	// keine gültige Emial-Adresse

	{

		return false;

	}

	return true;

}




function checked_form(f)
{

if(f.firstname.value == "")
{
alert('Please insert first name');
f.firstname.focus();
return false;
}

if(f.lastname.value == "")
{
alert('Please insert the last name');
f.lastname.focus();
return false;
}

if(f.city.value == "")
{
alert('Please insert the city!');
f.city.focus();
return false;
}

if(f.tel.value == "")
{
alert('Please insert your telphone number!');
f.tel.focus();
return false;
}

if(f.mail.value == "")
{
alert('Please insert your e-mail!');
f.mail.focus();
return false;
}

if(!check_email(f.mail.value))

{

  alert("Please insert correct e-mail form!");

  f.mail.focus();

  f.mail.select();

  return false;

}
if(f.enquiry.value == "")
{
alert('Please insert enquiry!');
f.enquiry.focus();
return false;
}

return true;
}