BeforeLoadEvent nadoen

[famlam]

Weet er iemand hoe je in Safari een beforeLoadEvent kunt nadoen?

In Chrome werkt deze code:
[JS]var fakeEvent = {
target: $("body")[0],
url: bgImage,
mustBePurged: true,
preventDefault: function(){},
type: "beforeload",
__proto__: BeforeLoadEvent
}
beforeLoadHandler(fakeEvent);[/JS]

Maar Safari zegt

Error: The first argument must be a beforeLoad event object.