function mkvis(lay1,lay2) {
    cleanup()
   if (parseFloat(navigator.appVersion) >= 4.0) {
      if (navigator.appName == "Netscape") {
         document.layers[lay2].visibility='show'
         document.layers[lay1].visibility='hidden'
      }
      else {
         document.all(lay2).style.visibility='visible'
         document.all(lay1).style.visibility='hidden'
      }
  }
  else {
      a=0;
  }
}

function mkimvis(lay) {
   if (parseFloat(navigator.appVersion) >= 4.0) {
      if (navigator.appName == "Netscape") {
         document.layers[lay].visibility='hidden'
      }
      else {
         document.all(lay).style.visibility='hidden'
      }
  }
  else {
      a=0;
  }
}

function cleanup() {
   if (parseFloat(navigator.appVersion) >= 4.0) {
      if (navigator.appName == "Netscape") {
         document.layers["lay1a"].visibility='show'
         document.layers["lay2a"].visibility='show'
         document.layers["lay3a"].visibility='show'
         document.layers["lay4a"].visibility='show'
         document.layers["lay5a"].visibility='show'
         document.layers["lay6a"].visibility='show'
         document.layers["lay1b"].visibility='hidden'
         document.layers["lay2b"].visibility='hidden'
         document.layers["lay3b"].visibility='hidden'
         document.layers["lay4b"].visibility='hidden'
         document.layers["lay5b"].visibility='hidden'
         document.layers["lay6b"].visibility='hidden'
      }
      else {
         document.all("lay1a").style.visibility='visible'
         document.all("lay2a").style.visibility='visible'
         document.all("lay3a").style.visibility='visible'
         document.all("lay4a").style.visibility='visible'
         document.all("lay5a").style.visibility='visible'
         document.all("lay6a").style.visibility='visible'
         document.all("lay1b").style.visibility='hidden'
         document.all("lay2b").style.visibility='hidden'
         document.all("lay3b").style.visibility='hidden'
         document.all("lay4b").style.visibility='hidden'
         document.all("lay5b").style.visibility='hidden'
         document.all("lay6b").style.visibility='hidden'
      }
  }
  else {
      a=0;
  }
}