[Livaanderiamarum]

как вариант

(function(name) {
	var el = document.createElement("iframe");
	document.body.appendChild(el);
	window[name] = window.frames[0].Function
})('FunctionX')

FunctionX.prototype.qq = function() {
	alert('НЯЯЯ)!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!111')
}

var q = FunctionX('', 'alert("fff")')

q()