// Verify that the value of personalization fields are
// the same.
function verify_personalization()
{
	var v1 = document.getElementById("pz1").value;
	var v2 = document.getElementById("pz2").value;
	var btn = document.getElementById("buy");
	if(v1 == v2 && v1 != ''){
	    btn.disabled = false;
	}
	else{
	    btn.disabled = true;
	}
}