var imageDisplayed=0; // save current image index

function slideSwap(imageName, newImage, secondImage){
    if (document.images){
      secondImage = (secondImage == null) ? "Off" : secondImage; // set 3rd argument
      var strSrc="image"+newImage+secondImage;
      if(window[strSrc]) { // check for existence of (second) image
        document[imageName].src = window[strSrc].src;
      }
      imageDisplayed=newImage; // reset index
    }
  }

function displayMessage(thisImage){
    if (document.images){
      if (thisImage == null){
        thisImage = 0;
      }
      thisImageName = "image"+thisImage+"On";
      if (window[thisImageName]){
        document.getElementById("messagebox").style.display = "block";
      }
      else {
        document.getElementById("messagebox").style.display = "none";
      }
    }
  }



function imgOn(imageID){
    if (document.images){
      document.getElementById(imageID).src = eval(imageID+"On.src");
    }
  }

function imgOff(imageID){
    if (document.images){
      document.getElementById(imageID).src = eval(imageID+"Off.src");
    }
  }


function galleryHighlight(itemID, onOff){
    var thumbname = itemID + "_thumb";
    var x1 = document.getElementById(itemID).style;
    var x2 = document.getElementById(thumbname).style;
    if(onOff == "on"){
      x1.color = "#ffffff";
      x1.textDecoration = "underline";
      x2.border = "1px solid #ffffff";
    }
    else {
      x1.color = "#bbbbbb";
      x1.textDecoration = "none";
      x2.border = "1px solid #232323";
    }
  }