function foto(url,target,w,h) {
  sb=0;w+=40;h+=48;
  if (w>window.screen.availWidth-10) {w=window.screen.availWidth-10;sb=1;}
  if (h>window.screen.availHeight-40) {h=window.screen.availHeight-40;sb=1;}
  w=window.open(url,target,"menubar=0,toolbar=0,status=0,resizable=1,scrollbars="+sb+",top=0,left=0,width="+w+",height="+h);
  return false;
}
function go(href) {
  window.location.href=href;
}
function show_menu(idmenu) {
  var m=document.getElementById(idmenu);
  m.style.visibility='visible'
}
function hide_menu(idmenu) {
  var m=document.getElementById(idmenu);
  m.style.visibility='hidden'
}