<!--
function on_img(n) {
  if(navigator.appName.charAt(0) == "M") {
    eval("document.all['MES"+n+"'].style.visibility = 'visible';");
  }
  if(navigator.appName.charAt(0) == "N") {
    eval("document.layers['MES"+n+"'].visibility = 'show';");
  }
}
function off_img(n) {
  if(navigator.appName.charAt(0) == "M") {
    eval("document.all['MES"+n+"'].style.visibility = 'hidden';");
  }
  if(navigator.appName.charAt(0) == "N") {
    eval("document.layers['MES"+n+"'].visibility = 'hide';");
  }
}
//-->