diff --git a/lib/gallery.show_full_size.js b/lib/gallery.show_full_size.js
index f617836bbd..9eb6f3af46 100644
--- a/lib/gallery.show_full_size.js
+++ b/lib/gallery.show_full_size.js
@@ -8,12 +8,12 @@
     var size = $.gallery_get_viewport_size();
 
     $("body").append('<div id="g-fullsize-overlay" class="ui-dialog-overlay" ' +
-		    'style="border: none; margin: 0; padding: 0; background-color: #000; ' +
-		    'position: absolute; top: 0px; left: 0px; ' +
-		    'width: ' + width + 'px; height: ' + height + 'px;' +
-        ' opacity: 0.7; filter: alpha(opacity=70);' +
-		    '-moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; ' +
-		    '-moz-background-inline-policy: -moz-initial; z-index: 1001;"> </div>');
+		     'style="border: none; margin: 0; padding: 0; background-color: #000; ' +
+		     'position: fixed; top: 0px; left: 0px; ' +
+		     'width: 100%; height: 100%; ' +
+		     'opacity: 0.7; filter: alpha(opacity=70); ' +
+		     '-moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; ' +
+		     '-moz-background-inline-policy: -moz-initial; z-index: 1001;"> </div>');
 
     var image_size;
     if (image_width >= size.width() - 6 || image_height >= size.height() - 6) {
@@ -26,14 +26,14 @@
     }
 
     $("body").append('<div id="g-fullsize" class="ui-dialog ui-widget" ' +
-		    'style="overflow: hidden; display: block; ' +
-		    'position: absolute; z-index: 1002; outline-color: -moz-use-text-color; ' +
-		    'outline-style: none; outline-width: 0px; ' +
-		    'height: ' + image_size.height + 'px; ' +
-		    'width: ' + image_size.width + 'px; ' +
-		    'top: ' + image_size.top + 'px; left: ' + image_size.left + 'px;">' +
-		    '<img id="g-fullsize-image" src="' + image_url + '"' +
-		    'height="' + image_size.height + '" width="' + image_size.width + '"/></div>');
+		     'style="overflow: hidden; display: block; ' +
+		     'position: absolute; z-index: 1002; outline-color: -moz-use-text-color; ' +
+		     'outline-style: none; outline-width: 0px; ' +
+		     'height: ' + image_size.height + 'px; ' +
+		     'width: ' + image_size.width + 'px; ' +
+		     'top: ' + image_size.top + 'px; left: ' + image_size.left + 'px;">' +
+		     '<img id="g-fullsize-image" src="' + image_url + '"' +
+		     'height="' + image_size.height + '" width="' + image_size.width + '"/></div>');
 
     $().click(function() {
       $("#g-fullsize-overlay*").remove();