randomword = "name";
randomword2 = "domain.com";
randomword3 = "Contact Us";
append = "?Subject=enter the default subject text here (otherwise delete this bolded text)&Body= ";
document.write('<a href=\"mailto:' + randomword + '@' + randomword2 + append + '\">');
document.write(randomword + '@' + randomword2 + '<\/a>');