function checkit() {
var var1 = document.tellafriend.name.value;
var var2 = document.tellafriend.you.value;
var var3 = document.tellafriend.friend.value;
var var4 = document.tellafriend.email.value;
if (var2 == "") {alert("Please enter your name\nso your friend will know\nwho sent this email."); return false;}
if (var3 == "") {alert("Please enter your friend's\nname so they'll open it."); return false;}
if (var4 == "") {alert("Please enter your friend's email address."); return false;}
}