Fade to black JS

function passage_fade(a,s,e,n,r){var i=$('<div id="black" />');i.css("background-image",r),$(document.body).append(i).find("#black").fadeIn(s).delay(e).fadeOut(n),setTimeout(function(){Engine.play(a)},s),setTimeout(function(){$("#black").remove()},s+e+n+500)}Macro.add("passagefade",{handler:function(){var a;if(this.args.length<4||this.args.length>5)return this.error("Invalid number of arguments!");a=4==this.args.length?"none":"url('"+this.args[4]+"')",console.log(a),passage_fade(this.args[0],this.args[1],this.args[2],this.args[3],a)}});