function change(i)
{
    var j;
	for (j=1;j<4;j++)
	{
		if(j==i)
		{
		    //??????
		   
			    document.getElementById("e"+j).className="active"; //???????
		
			document.getElementById("f"+j).style.display="";		   
		}
		else
		{		    
		  
			    document.getElementById("e"+j).className=""; //???????????
		
			document.getElementById("f"+j).style.display="none";	
						
		}
	}
}