function setFocus3(i)
{ selectLayer3(i);}
function selectLayer3(i)
{ switch(i)
 { case 1:
 document.getElementById("N1").className="toocle2";
 document.getElementById("N2").className="toocle1";
 document.getElementById("N3").className="toocle1";
 break;
 case 2:
 document.getElementById("N1").className="toocle1";
 document.getElementById("N2").className="toocle2";
 document.getElementById("N3").className="toocle1";
 break;
  case 3:
 document.getElementById("N1").className="toocle1";
 document.getElementById("N2").className="toocle1";
 document.getElementById("N3").className="toocle2";
 break;}}