Error.prototype.stack, Other Browsers

Does anyone know of a hacked up JS patch for Error.prototype.stack or a getStack functionality for IE and Safari?

Does Opera have Error.prototype.stack?

Maybe something like:

Code:
Error.getStack = function getStack( error ) {
if( error.stack ) return error.stack;

// look up the call chain...
var fakeStack = [ ];
for( var caller = arguments.callee.caller;
caller != null; caller = callee.caller ) {
fakeStack.push( caller );
}
return fakeStack;
};
This is just typed in. I need tested library code that I can rely on.