// Function to swap out the appropriate image and text
    function swap(selected) {
   	if (document.images) {

        // We don't want to swap images if the mouse is over the current icon
        // prevSelected is stored at the end of the function for future use
	  if (selected != prevSelected)
	  {
          // Turn the selected image On
	    document[selected + "_icon"].src= eval(selected + "On.src")
          // Change the bigpicture image to match the selected icon
	  // document["bigpicture"].src= eval(selected + ".src")
          // Turn the previous icon image Off
	    document[prevSelected + "_icon"].src= eval(prevSelected + "Off.src")

          // Change the text layer based on the type of browser
          //  Used for backward compatibility and NS/MS code differences
          if (isNS || isNS4) {
             eval("document.layers['" + prevSelected + "'].visibility='hidden'");
             eval("document.layers['" + selected + "'].visibility='visible'");
          }
          else if (isIE || isIE4) {
             eval("document.all['" + prevSelected + "'].style.visibility='hidden'");
             eval("document.all['" + selected + "'].style.visibility='visible'");
          }
          else if (isIE5 || isNS6) {
             document.getElementById(prevSelected).style.visibility="hidden";
             document.getElementById(selected).style.visibility="visible";
          }
          else {
             // Punt!
             // Try using the World Wide Web Consortium's (W3C) recommendations for the
             // Document Object Model (DOM), Cascading Stylesheets (CSS) and
             // ECMAScript - JavaScript's standard - as of 2003?
             document.getElementById(prevSelected).style.visibility="hidden";
             document.getElementById(selected).style.visibility="visible";
          }

          // Store the current value to test next time in code
          prevSelected = selected;
	  }
	}
    }

    // Determine if the browser is Internet Explorer, Navigator,
    // or other. Also, set the layer variable depending on the
    // type of access it needs.
    function checkBrowser(){
      isNS = (document.layers) ? true : false;
      isIE = (document.all) ? true : false;
      isNS4 = (document.layers) ? true : false;
      isIE4 = (document.all && !document.getElementById) ? true : false;
      isIE5 = (document.all && document.getElementById) ? true : false;
      isNS6 = (!document.all && document.getElementById) ? true : false;
    }

    // Create global variables for browser type
    var isNS = new Boolean(false);
    var isIE = new Boolean(false);
    var isNS4 = new Boolean(false);
    var isIE4 = new Boolean(false);
    var isIE5 = new Boolean(false);
    var isNS6 = new Boolean(false);

    // Initialize prevSelected to the first icon turned On
    var prevSelected="mission";
 
    // Set image name objects to their source
    if (document.images) {

    mission = new Image;
    mission.src = "images/mission.jpg";

    missionOff = new Image;
    missionOff.src = "images/missionOff.jpg";

    missionOn = new Image;
    missionOn.src = "images/missionOn.jpg";

    phone = new Image;
    phone.src = "images/phone.jpg";

    phoneOff = new Image;
    phoneOff.src = "images/phoneOff.jpg";

    phoneOn = new Image;
    phoneOn.src = "images/phoneOn.jpg";

    winsol = new Image;
    winsol.src = "images/winsol.jpg";

    winsolOff = new Image;
    winsolOff.src = "images/winsolOff.jpg";

    winsolOn = new Image;
    winsolOn.src = "images/winsolOn.jpg";

    future = new Image;
    future.src = "images/future.jpg";

    futureOff = new Image;
    futureOff.src = "images/futureOff.jpg";

    futureOn = new Image;
    futureOn.src = "images/futureOn.jpg";

    clock = new Image;
    clock.src = "images/clock.jpg";

    clockOff = new Image;
    clockOff.src = "images/clockOff.jpg";

    clockOn = new Image;
    clockOn.src = "images/clockOn.jpg";

    people = new Image;
    people.src = "images/people.jpg";

    peopleOff = new Image;
    peopleOff.src = "images/peopleOff.jpg";

    peopleOn = new Image;
    peopleOn.src = "images/peopleOn.jpg";
}