FarmVilleAutoAccept.user.js

// ==UserScript==
// @name        FarmVilleAutoAcceptBot
// @namespace   http://dasLampe.lano-crew.org
// @description Autoaccept of Gifts, for Greasemonkey
// @include http://apps.facebook.com/onthefarm/*
// @include https://apps.facebook.com/onthefarm/*
// ==/UserScript==

function main()
{	
	var button = document.getElementsByName("acceptReward");
	for(var i = 0; i < button.length; i++)
	{
		if(button[i].className == "inputyessubmit")
		{
			button[i].click();
		}
	}
}

main();