var nn; 
nn=1; 
setTimeout('change_img()',3000); 
function change_img() 
{ 
 if(nn>3) nn=1 
 setTimeout('setFocus1('+nn+')',3000); 
 nn++; 
 tt=setTimeout('change_img()',3000); 
} 
function setFocus1(i) 
{ 
 selectLayer1(i); 
} 
function selectLayer1(i) 
{ 
 switch(i) 
 { 
 case 1: 
 document.getElementById("focusPic1").style.display="block"; 
 document.getElementById("focusPic2").style.display="none"; 
 document.getElementById("focusPic3").style.display="none"; 
 document.getElementById("focusPic4").style.display="none"; 
 document.getElementById("focusPic1nav").style.display="block"; 
 document.getElementById("focusPic2nav").style.display="none"; 
 document.getElementById("focusPic3nav").style.display="none"; 
 document.getElementById("focusPic4nav").style.display="none"; 
 break; 
 case 2: 
 document.getElementById("focusPic1").style.display="none"; 
 document.getElementById("focusPic2").style.display="block"; 
 document.getElementById("focusPic3").style.display="none"; 
 document.getElementById("focusPic4").style.display="none"; 
 document.getElementById("focusPic1nav").style.display="none"; 
 document.getElementById("focusPic2nav").style.display="block"; 
 document.getElementById("focusPic3nav").style.display="none"; 
 document.getElementById("focusPic4nav").style.display="none"; 
 break; 
 case 3: 
 document.getElementById("focusPic1").style.display="none"; 
 document.getElementById("focusPic2").style.display="none"; 
 document.getElementById("focusPic3").style.display="block"; 
 document.getElementById("focusPic4").style.display="none"; 
 document.getElementById("focusPic1nav").style.display="none"; 
 document.getElementById("focusPic2nav").style.display="none"; 
 document.getElementById("focusPic3nav").style.display="block"; 
 document.getElementById("focusPic4nav").style.display="none"; 
 break; 
 case 4: 
 document.getElementById("focusPic1").style.display="none"; 
 document.getElementById("focusPic2").style.display="none"; 
 document.getElementById("focusPic3").style.display="none"; 
 document.getElementById("focusPic4").style.display="block"; 
 document.getElementById("focusPic1nav").style.display="none"; 
 document.getElementById("focusPic2nav").style.display="none"; 
 document.getElementById("focusPic3nav").style.display="none"; 
 document.getElementById("focusPic4nav").style.display="block"; 
 break; 
 } 
}