var dimages=new Array();
var numImages=21;
for (i=1; i<=numImages; i++)
{
  dimages[i]=new Image();
  dimages[i].src="image/gallery_images/jpeg/Image"+(i+1)+".jpg";
}
var curImage=0;
 
function swapPicture(up)
{
  if (document.images)
  {
	if(up==1)
	{
		
		var nextImage=curImage+1;
		if (nextImage>=numImages)
		  nextImage=0;
		  
		 curImage=nextImage;
	}
	if(up==0)
	{
		var nextImage=curImage-1;
		if (nextImage==0)
		  nextImage=numImages;
		curImage=nextImage;
	}	

	var target=0;
    if (document.images.myImage)
      target=document.images.myImage;
    if (document.all && document.getElementById("myImage"))
      target=document.getElementById("myImage");
  
      // make sure target is valid.  It might not be valid
      //   if the page has not finished loading
    if (target)
	{
      target.src=dimages[nextImage].src; 
	 
	}
  }
}

 
 
//-->