function changeBody(index){     

switch(index){     
case 1:{     

document.getElementById('div1').style.display = "";     
document.getElementById('img1').src="img/zuix1.jpg";



document.getElementById('div2').style.display = "none"; 
document.getElementById('img2').src="img/anq.jpg";


document.getElementById('div3').style.display = "none";     
document.getElementById('img3').src="img/anl.jpg";

break;     
    }     
case 2:{     

document.getElementById('div1').style.display = "none";     
document.getElementById('img1').src="img/zuix.jpg";

document.getElementById('div2').style.display = "";   
document.getElementById('img2').src="img/anq1.jpg";


document.getElementById('div3').style.display = "none";     
document.getElementById('img3').src="img/anl.jpg";
break;     
    }     
case 3:{     

document.getElementById('div1').style.display = "none";     
document.getElementById('img1').src="img/zuix.jpg";

document.getElementById('div2').style.display = "none";  
document.getElementById('img2').src="img/anq.jpg";


document.getElementById('div3').style.display = "";   
document.getElementById('img3').src="img/anl1.jpg";

break;     
      }     
   }     
}