From 221d7caf70ace66041c41fc8c62412932e367f4e Mon Sep 17 00:00:00 2001
From: ahocevar <andreas.hocevar@gmail.com>
Date: Mon, 20 Feb 2012 12:01:56 +0100
Subject: [PATCH] Using a blankImgUrl that works for IFrames in IE9.

See http://trac.osgeo.org/openlayers/ticket/3624.
---
 lib/OpenLayers/Tile/Image/IFrame.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/OpenLayers/Tile/Image/IFrame.js b/lib/OpenLayers/Tile/Image/IFrame.js
index eefa7bbe91..b29798cccc 100644
--- a/lib/OpenLayers/Tile/Image/IFrame.js
+++ b/lib/OpenLayers/Tile/Image/IFrame.js
@@ -65,7 +65,11 @@ OpenLayers.Tile.Image.IFrame = {
                 // And if we had an iframe we also remove the event pane.
 
                 if(fromIFrame) {
+                    this.blankImageUrl = this._blankImageUrl;
                     this.frame.removeChild(this.frame.firstChild);
+                } else {
+                    this._blankImageUrl = this.blankImageUrl;
+                    this.blankImageUrl = "about:blank";
                 }
             }
         }
@@ -85,7 +89,7 @@ OpenLayers.Tile.Image.IFrame = {
                 style.width = "100%";
                 style.height = "100%";
                 style.zIndex = 1;
-                style.backgroundImage = "url(" + this.blankImageUrl + ")";
+                style.backgroundImage = "url(" + this._blankImageUrl + ")";
                 this.frame.appendChild(eventPane);
             }
 
@@ -133,7 +137,7 @@ OpenLayers.Tile.Image.IFrame = {
             return OpenLayers.Tile.Image.prototype.getImage.apply(this, arguments);
         }
     },
-
+    
     /**
      * Method: createRequestForm
      * Create the html <form> element with width, height, bbox and all