function checkform(){

	if(document.invitation.firstName.value == ""){
	 alert("Please fill in the First Name field")

	}
	else if(document.invitation.lastName.value == ""){
	 alert("Please fill in the Last Name field")



	}
	else if(document.invitation.email.value == ""){
	 alert("Please fill in the E-mail field")



	}
	else if(document.invitation.phone.value == ""){
	 alert("Please fill in the Phone field")



	}
	else{

	document.invitation.submit();

	}


}