function selectLayer(i) 
{ 
 switch(i) 
 { 
 case 1: 
 document.getElementById("focusPic1").style.display="inline"; 
 document.getElementById("focusPic2").style.display="none"; 
 document.getElementById("focusPic3").style.display="none"; 
 break; 
 case 2: 
 document.getElementById("focusPic1").style.display="none"; 
 document.getElementById("focusPic2").style.display="inline"; 
 document.getElementById("focusPic3").style.display="none"; 
 break; 
 case 3: 
 document.getElementById("focusPic1").style.display="none"; 
 document.getElementById("focusPic2").style.display="none"; 
 document.getElementById("focusPic3").style.display="inline";  

 break; 
  } 
}