var s1 = "tama";
var s2 = "da";
var s3 = "@";
var s4 = "1-shop";
var s5 = "-net.com";
document.write("e-mail:<a href=" + "mail" + "to:" + s1 + s2 +
s3 + s4 + s5 + ">" + s1 + s2 + s3 + s4 + s5 + "</a>");