coded = "2but@ z. 9ebcc wnecDbsfBJvSebcc.esSk"
key = "7Xt3yRMWk<aI9TlPEn6mpjZOvs2eUCLiJdBS0>D1VGzAqwfHx4FNQ@rKoh8Yuc5bg"
shift=coded.length
plain=""
for (i=0; i<coded.length; i++){
    if (key.indexOf(coded.charAt(i))==-1){
        ltr=coded.charAt(i)
        plain+=(ltr)
    } else {
        ltr = (key.indexOf(coded.charAt(i))-shift+key.length) % key.length
        plain+=(key.charAt(ltr))
    }
}
document.write("<a href='mailto:"+plain+"'>Kevin M. Goess</a>")