var win = null;
function zoom(mypage,myname,w,h,scroll){
LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
settings =
'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',toolbar=0,location=0,directories=0,menuBar=0,scrollbars=0,resizable=0'
win = window.open(mypage,myname,settings)
if(win.window.focus){win.window.focus();}
}
ok=0; old_what="non";
function show(what){
  if((old_what != "non") && (what != old_what)){
 ok=1;

 old_what.style.display="none";
 what.style.display="";
  }else
  {
 if(ok){
  ok=0;
  what.style.display="none";
 }else
 {
  ok=1;
  what.style.display="";
 }
  }
  old_what=what;
}