var DOMAIN = "Schule.LandSH.de";
var KONTAKT = "Kaiser-Karl-Schule.Itzehoe";
var ATCHAR = "@";
var ACTION = "mailto:";

document.write('<a href="' + ACTION + KONTAKT + ATCHAR + DOMAIN + '">Kaiser-Karl-Schule.Itzehoe <i>bei</i> Schule.LandSH.de</a>');