function setFocus01(i)
{
 selectLayer01(i);
}
function selectLayer01(i)
{
 switch(i)
 {
 case 1:
 document.getElementById("foreshow01").style.display="block";
 document.getElementById("foreshow02").style.display="none";
 document.getElementById("foreshow03").style.display="none";
 break;
 case 2:
 document.getElementById("foreshow01").style.display="none";
 document.getElementById("foreshow02").style.display="block";
 document.getElementById("foreshow03").style.display="none";
 break;
 case 3:
 document.getElementById("foreshow01").style.display="none";
 document.getElementById("foreshow02").style.display="none";
 document.getElementById("foreshow03").style.display="block";
 break;
 }
}