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(); } }