Event.observe(window,'load',function(){
	$('tool').onmouseover=function(){	
		new Effect.Appear('attan',{duration:1,from:0,to:1,fps:25});
		
	},
	$('tool').onmouseout=function(){	
		new Effect.Fade('attan',{duration:1,from:1,to:0,fps:25});
		
	}
	
})