var first = 'ma';
var second = 'il';
var third = 'to:';

var ename = 'eat', edomain = 'tajstevenage.com';
document.write( '<a id="address" href="../');
document.write(first+second+third);
document.write( ename  + '@' + edomain + '" title="Link: Email us">' + ename + ' at ' + edomain + '</a>' );