var a = "southendbachchoir";
var b = "tiscali.co.uk";
var c = "?subject=Requesting%20information%20about%20the%20Southend%20Bach%20Choir.";
var linktext = "e-mail";

document.write("<a href=" + "mail" + "to:" + a + "@" + b + c + ">" + linktext + "</a>")