<!--

function getObj(id) {
    if (document.getElementById) { // DOM-compliant browsers (MSIE5, NSN6, O5)
        return document.getElementById(id);
    } else if (document.all) { // MSIE4
        return document.all[id];
    } else if (document.layers) { // NSN4
        return document.layers[id];
    } else { // Trap DHTML-impaired browsers
        return false;
    }
}

function isEmail(who) {
	var email=/^[A-Za-z0-9]+([_\.-][A-Za-z0-9]+)*@[A-Za-z0-9]+([_\.-][A-Za-z0-9]+)*\.([A-Za-z]){2,4}$/i;
	return(email.test(who));
}

function ValidateEmail(){

	var checkEmail11,checkEmail2,checkEmail3;

	checkEmail1 = getObj('Email1').value;
	checkEmail2 = getObj('Email2').value;
	checkEmail3 = getObj('Email3').value;

	if (checkEmail1.length < 1 && checkEmail2.length < 1 && checkEmail3.length < 1){
		alert("Please enter your friend's email address.");
		return false;
	}

	if (checkEmail1.length > 0){
		if(!isEmail(checkEmail1)){
			alert("Please enter a valid email address.");
			return false;
		}
	}

	if (checkEmail2.length > 0){
		if(!isEmail(checkEmail2)){
		alert("Please enter a valid email address.");
		return false;
		}
	}

	if (checkEmail3.length > 0){
		if(!isEmail(checkEmail3)){
		alert("Please enter a valid email address.");
		return false;
		}
	}

}
//-->