function checkform(){
 	if (document.getElementById('fname').value == ""){
 	 	alert("Please enter your first name.");
 	 	return false;
 	}
 	if (document.getElementById('lname').value == ""){
 	 	alert("Please enter your last name.");
 	 	return false;
 	}
 	if (document.getElementById('recipient').value == "default"){
 		alert("Please choose a recipient.");
 		return false;
 	}
 	if (validate_email(document.getElementById('email'),"Not a valid e-mail address!")==false){
		return false;
	}
	if (document.getElementById('message').value == ""){
	 	alert("Please write a message.");
	 	return false;
	}
}

function validate_email(field,alerttxt){
	with (field){
		apos=value.indexOf("@");
		dotpos=value.lastIndexOf(".");
		if (apos<1||dotpos-apos<2) {
		 	alert(alerttxt);
			return false;
		}
		else {
		 	return true;
		}
	}
}