var first = 'ma';
var second = 'il';
var third = 'to:';
var address = 'info';
var domain = 'bartram-bau.de';
document.write('<a href="');
document.write(first+second+third);
document.write(address);
document.write('&#64;');
document.write(domain);
document.write('" title="">');
document.write('info@bartram-bau.de<\/a>');