function doPreload() {
	preloadImages(gallery_images);
}

function preloadImages(images_array) {
	for (var i = 0; i < images_array.length; i++) {
	    var image = new Image();
	    image.src = images_array[i];
    }
}

function swapImage (incrementOrDecrement) {
	var temp;
	var value;
	if (incrementOrDecrement == "increment") {
	   if (current_image < last_image) {
	      current_image++;
	      document.gallery_image.src = gallery_images[current_image];
	      temp++;
	   }
	   if (current_image == last_image) {
	      current_image++;
	      document.gallery_image.src = gallery_images[current_image];
	      temp++;
	   }
	   if (current_image > last_image) {
	      current_image = 0;
	      document.gallery_image.src = gallery_images[current_image];
	      temp = 0;
	   }
	}

	if (incrementOrDecrement == "decrement") {
	   if (current_image == "0") {
	      current_image = last_image;
	      document.gallery_image.src = gallery_images[current_image];
	      temp = last_image;
	   }
	   if (current_image < "0") {
	      current_image = last_image;
	      document.gallery_image.src = gallery_images[current_image];
	      temp = last_image 
	   }
	   if (current_image > 0) {
	      current_image--;
	      document.gallery_image.src = gallery_images[current_image];
	      temp--;
	   }
	}
	current_image_displayed = (current_image + 1);

}

function popUpPhoto(image_requested, current_image_l, last_image_l, state, code) {
	var win = window.open("./gallery.html", "photo", "toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=1,height=455,width=570,top=25,left=25");
	if (window.focus) {
	   win.focus();
	}
}