function valid(){
a = document.laoyalty;
if(a.firstname.value==""){
alert("Please enter your firstname.");
a.firstname.focus();
a.firstname.select();
return false;
}
if(a.address.value==""){
alert("Please enter your address.");
a.address.focus();
a.address.select();
return false;
}
if(a.Email.value==""){
alert("Please enter your Email");
a.Email.focus();
a.Email.select();
return false;
}
else
{
	var emailfilter=/^\w+[\+\.\w-]*@([\w-]+\.)*\w+[\w-]*\.([a-z]{2,4}|\d+)$/i
	var returnval=emailfilter.test(document.laoyalty.Email.value)
	if (returnval==false){
		alert("Please enter a valid Email address.")
		document.laoyalty.Email.select()
		return false;
}
}
if(a.dob.value==""){
alert("Please enter your date of birth.");
a.dob.focus();
a.dob.select();
return false;
}
if(a.gender.value==""){
alert("Please select gender.");
a.gender.focus();
a.gender.select();
return false;
}
if(a.telephone.value==""){
alert("Please enter telephone.");
a.telephone.focus();
a.telephone.select();
return false;
}
if(a.product.value==""){
alert("Please enter your favorate product.");
a.product.focus();
a.product.select();
return false;
}

return true;
}