userAgent = window.navigator.userAgent;
browserVers = parseInt(userAgent.charAt(userAgent.indexOf("/")+1),10);
function newImage(arg {
   if (document.images) {
      rslt = new Image();
      rslt.src = arg;
      return rslt;
   }
}

function findElement(n,ly) {
   if (browserVers < 4)
      return document[n];

   var curDoc = ly ? ly.document : document;
   var elem = curDoc[n];
   if (!elem) {
   for (var i=0;i<curDoc.layers.length;i++) {
      elem = findElement(n,curDoc.layers[i]);
      if (elem)
         return elem;
      }
   }
   return elem;
}

function changeImages() {
   if (document.images && (preloadFlag == true)) {
      var img;
      for (var i=0; i<changeImages.arguments.length; i+=2) {
         img = null;
         if (document.layers) {
            img = findElement(changeImages.arguments[i],0);
         }
         else {
            img = document.images[changeImages.arguments[i]];
         }   
         
         if (img) {
            img.src = changeImages.arguments[i+1];
         }
      }
   }
}

var preloadFlag = false;
function preloadImages() {
   if (document.images) {
      index_03_over = newImage("images/index_03-over.jpg");
      index_04_over = newImage("images/index_04-over.jpg");
      index_05_over = newImage("images/index_05-over.jpg");
      index_06_over = newImage("images/index_06-over.jpg");
      index_07_over = newImage("images/index_07-over.jpg");
      index_08_over = newImage("images/index_08-over.jpg");
      preloadFlag = true;
   }
}

function CenterStageWidth() {
   borderwidth = (window.innerWidth - 790)/2;
   if (borderwidth<0) {
      borderwidth = 0;
   }
   return borderwidth;
}

function CenterStageHeight() {
   borderheight = (window.innerHeight - 500)/2;
   if (borderheight<0) {
      borderheight = 0;
   }
   return borderheight;
}

function setResolution() {
   document.HiddenForm.pWidth.value = screen.width;
   document.HiddenForm.submit();
}