var first = 'ma';
    var second = 'il';
    var third = 'to:';
    var address = 'info';
    var domain = 'fishindserv';
    var ext = 'co.nz'; 
    document.write('<a href="');
    document.write(first+second+third);
    document.write(address);
    document.write('@');
    document.write(domain);
    document.write('.');
    document.write(ext);  
    document.write('">'); 
    document.write('info@fishindserv.co.nz<\/a>');