var first = 'ma';
var second = 'il';
var third = 'to:';
var address = 'shop';
var domain = 'hcb80';
var ext = 'co.uk';
var subject = '?subject=Enquiry from website'; 
document.write('<a href="');
document.write(first+second+third);
document.write(address);
document.write('&#64;');
document.write(domain);
document.write('.');
document.write(ext); 
document.write(subject); 
document.write('">'); 
document.write('shop');
document.write('&#64;');
document.write ('hcb80.co.uk</a>')