var isNS;
var isIE;

// Detect if client's using Netscape or IE
if (parseInt(navigator.appVersion) >= 4) {
 if (navigator.appName == "Netscape") {
  isNS = true;
 }
 else {
  isIE = true;
 }
}

// Show specified layer
function showLayer(lyrName) {
 if (isNS) {
  document.layers[lyrName].visibility = 'visible';
 }
 else {
  document.all[lyrName].style.visibility = 'visible';
 }
}

// Hide specified layer
function hideLayer(lyrName) {
 if (isNS) {
  document.layers[lyrName].visibility = 'hidden';
 }
 else {
  document.all[lyrName].style.visibility = 'hidden';
 }
}

// Show Descriptions and hide other layers
function dcpShow() {
 showLayer('Description');
 hideLayer('EngageText');
}

// Hide/Close Description layer
function dcpHide() {
 hideLayer('Description');
 showLayer('EngageText');
 window.location.href = "pm.htm";
}