// Check for email address: look for [@] and [.] 
function isEmail(elm) {
    if (elm.value.indexOf("@") + "" != "-1" &&
        elm.value.indexOf(".") + "" != "-1" &&
        elm.value != "") 
    return true;
    else return false;
}

// Check for null and for empty
function isFilled(elm) {
    if (elm.value == "" ||
        elm.value == null) 
    return false;
    else return true;
}

function isSendReady(form) {

	// is name element filled ?
	if (isFilled(form.name) == false) { 
		alert("Please enter your name.");
		form.name.focus();
		return false;
	}
	
	// is address element a real email address?
	if (isEmail(form.your_email) == false) { 
		alert("Please enter a valid email address.");
		form.your_email.focus();
		return false;
	}
	
	// is first friends name element filled ?
	if ((isFilled(form.friend_a) == false) && (isFilled(form.friend_b) == false) && (isFilled(form.friend_c) == false) && (isFilled(form.friend_d) == false) && (isFilled(form.friend_e) == false)) { 
		alert("You must enter at least one friend's email address.");
		form.friend_a.focus();
		return false;
	} else {
		if (isFilled(form.friend_a) == true) { 
			if (isEmail(form.friend_a) == false) { 
				alert("Please enter a valid email address for your friend.");
				form.friend_a.focus();
				return false;
			}
		}
		if (isFilled(form.friend_b) == true) { 
			if (isEmail(form.friend_b) == false) { 
				alert("Please enter a valid email address for your friend.");
				form.friend_b.focus();
				return false;
			}
		}
		if (isFilled(form.friend_c) == true) { 
			if (isEmail(form.friend_c) == false) { 
				alert("Please enter a valid email address for your friend.");
				form.friend_c.focus();
				return false;
			}
		}
		if (isFilled(form.friend_d) == true) { 
			if (isEmail(form.friend_d) == false) { 
				alert("Please enter a valid email address for your friend.");
				form.friend_d.focus();
				return false;
			}
		}
		if (isFilled(form.friend_e) == true) { 
			if (isEmail(form.friend_e) == false) { 
				alert("Please enter a valid email address for your friend.");
				form.friend_e.focus();
				return false;
			}
		}
	}

return true;
}

function openNewWindow(url,name) {
  
  popupWin = window.open(url, name, '')
        
}