var first2 = 'ma';
var second2 = 'il';
var third2 = 'to:';

// example: Username
var address2 = 'sales';

// example: hotmail
var domain2 = 'countryrv';

// Subject Line
var fourth2 = '?Subject= Country RV WebMail';

var ext = 'net'; 

document.write('<a href="');
document.write(first2+second2+third2);
document.write(address2);
document.write('&#64;');
document.write(domain2);
document.write('.');
document.write(ext); 
document.write(fourth2);
document.write('" class="content">'); 
document.write('sales&#64;countryrv.net</a>');