var first = 'ma';
var second = 'il';
var third = 'to:';
var address = 'sales';
var domain = 'fuzeblocks';
var ext = 'com'; 
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('">'); 
document.write(' Cont');
document.write('act Us</a>');