The packing algorithm is forgiving of all forms of JavaScript with one exception. You must correctly terminate all JavaScript statements with semi-colons. This includes function expressions.
Here is an example of correct, semi-colon terminated JavaScript:

// sample code

var input, output;

// notice the semi-colon at the END of function expressions

onload = function() {
 input = document.getElementById("input");
 output = document.getElementById("output");
 clearAll(true);
};

function packScript() {
 output.value = pack(input.value);
}

function clearAll(focus) {
 output.value = input.value = "";
 // the "if" statement is NOT terminated with a semi-colon
 if (focus) {
  input.focus();
 }
}

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