function checkData() {
	var correct = true;
	if (document.Add2it.yourname.value == "") {
		correct = false; 
		alert("Please fill in your name.")
	}
	if (document.Add2it.youremail.value == "") {
		correct = false; 
		alert("Please fill in your valid e-mail addresses.")
	} 
	if (document.Add2it.friendsemail_1.value != "" && document.Add2it.friendsname_1.value == "") {
		correct = false; 
		alert("Please fill in your 1st friends name.")
	} 
	if (document.Add2it.friendsemail_2.value != "" && document.Add2it.friendsname_2.value == "") {
		correct = false; 
		alert("Please fill in your 2nd friends name.")
	} 
	if (document.Add2it.friendsemail_3.value != "" && document.Add2it.friendsname_3.value == "") {
		correct = false; 
		alert("Please fill in your 3rd friends name.")
	} 
	if (document.Add2it.friendsemail_1.value == "" && document.Add2it.friendsemail_2.value == "" && document.Add2it.friendsemail_3.value == "") {
		correct = false; 
		alert("Please fill in at least one of your friends valid e-mail addresses.")
	} 
	if (correct){
		alert("Thank you for sending this to your friends.")
	} 
	return correct; 
}