function mailto (name, domain, domainExt, subject) {
	if (subject != null) {
		var location = 'mailto:' + name + '@' + domain + '.' + domainExt + '?subject=' + encodeURIComponent(subject);
	}
	else {
		var location = 'mailto:' + name + '@' + domain + '.' + domainExt;
	}
	
	document.location = location;
}