Made an unpacker (still have to make the JavaScript Packer to compress to this format) that does not need to have assigned character list to match the mapped layout, instead it uses the number of replacement. Made this a while ago, but not long until you are using 2 bytes or more per replacement. The packer will do this with only repeated words …

unpacker.js

var W,H,A,K='0("1 11 10.12");2("3 11 10.12");4("5 11 10.12");6.7="8 9 11 10.12";';H=13;
A='alert,HERE,prompt,THERE,confirm,EVERYWHERE,test,value,HELLO,WORLD,WHAK,From,com'[W='split'](',');
while(H--){if(K[H]){K=K[W](H).join(A[H])}}eval(K);

//unpacked
/*
alert("HERE From WHAK.com");
prompt("THERE From WHAK.com");
confirm("EVERYWHERE From WHAK.com");
test.value="HELLO WORLD From WHAK.com";
*/