/**
 * Composes a valid email address
 *
 * @param username string The part of the address before the @
 * @param ulength interger The number of char to remove from the username
 * @param domain string The part of the address after the @
 * @param dlength integer The number of chars to remove from the domain
 **/

function lav_gyldig_email_adresse(username, ulength, domain, dlength) {
	var username = username.substring(ulength, username.length);
	var domain = domain.substring(dlength, domain.length);
	return username + '@' + domain;
}

function lav_email_adresse(username, ulength, domain, dlength) {
	void(location.href = "mailto:" + lav_gyldig_email_adresse(username, ulength, domain, dlength));	
}