var first = 'ma';
var second = 'il';
var third = 'to:';
var address = 'tradersupport';
var domain = 'rvtrader';
var ext = 'com'; 
document.write('<a class="topmail" href="');
document.write(first+second+third);
document.write(address);
document.write('@');
document.write(domain);
document.write('.');
document.write(ext); 
document.write('">'); 
document.write('Email Us</a>');