allow read jpg field textures

gframe/image_manager.cpp

@@ -103,6 +103,9 @@ irr::video::ITexture* ImageManager::GetTextureField(int code) {
 		char file[256];
 		sprintf(file, "pics/field/%d.png", code);
 		irr::video::ITexture* img = driver->getTexture(file);
+		if(img == NULL) {
+			sprintf(file, "pics/field/%d.jpg", code);
+			irr::video::ITexture* img = driver->getTexture(file);
 			if(img == NULL) {
 				tFields[code] = NULL;
 				return NULL;
@@ -110,6 +113,10 @@ irr::video::ITexture* ImageManager::GetTextureField(int code) {
 				tFields[code] = img;
 				return img;
 			}
+		} else {
+			tFields[code] = img;
+			return img;
+		}
 	}
 	if(tit->second)
 		return tit->second;