diff --git a/mamweb/static/css/mamweb.css b/mamweb/static/css/mamweb.css
index 84c613f8..2d0a283f 100644
--- a/mamweb/static/css/mamweb.css
+++ b/mamweb/static/css/mamweb.css
@@ -58,24 +58,24 @@ h2 {
 #header {
 	position: relative;
 	font-size: 250%;
-	background: url("../images/header-bg-uvod.png") no-repeat center top;
+	background: url("../images/header-bg-uvod.jpg") no-repeat center top;
 	height: 255px;
 	top: -1px;
 }
 
 
-#header.cojemam { background-image: url("../images/header-bg-uvod.png"); }
-#header.soustredeni { background-image: url("../images/header-bg-soustredeni.png"); }
-#header.zadani { background-image: url("../images/header-bg-zadani.png"); }
-#header.clanky { background-image: url("../images/header-bg-clanek.png"); }
-#header.archiv { background-image: url("../images/header-bg-archiv.png"); }
+#header.cojemam { background-image: url("../images/header-bg-uvod.jpg"); }
+#header.soustredeni { background-image: url("../images/header-bg-soustredeni.jpg"); }
+#header.zadani { background-image: url("../images/header-bg-zadani.jpg"); }
+#header.clanky { background-image: url("../images/header-bg-clanek.jpg"); }
+#header.archiv { background-image: url("../images/header-bg-archiv.jpg"); }
 
-#header.NOC {background-image: url("../images/header-bg-uvod-NOC.png"); }
-#header.NOCcojemam { background-image: url("../images/header-bg-uvod-NOC.png"); }
-#header.NOCsoustredeni { background-image: url("../images/header-bg-soustredeni-NOC.png"); }
-#header.NOCzadani { background-image: url("../images/header-bg-zadani-NOC.png"); }
-#header.NOCclanky { background-image: url("../images/header-bg-clanek-NOC.png"); }
-#header.NOCarchiv { background-image: url("../images/header-bg-archiv-NOC.png"); }
+#header.NOC {background-image: url("../images/header-bg-uvod-NOC.jpg"); }
+#header.NOCcojemam { background-image: url("../images/header-bg-uvod-NOC.jpg"); }
+#header.NOCsoustredeni { background-image: url("../images/header-bg-soustredeni-NOC.jpg"); }
+#header.NOCzadani { background-image: url("../images/header-bg-zadani-NOC.jpg"); }
+#header.NOCclanky { background-image: url("../images/header-bg-clanek-NOC.jpg"); }
+#header.NOCarchiv { background-image: url("../images/header-bg-archiv-NOC.jpg"); }
 
 #header img.logo {
 	position: absolute;
diff --git a/mamweb/static/images/header-bg-archiv-NOC.jpg b/mamweb/static/images/header-bg-archiv-NOC.jpg
new file mode 100644
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diff --git a/mamweb/static/images/header-bg-archiv-NOC.png b/mamweb/static/images/header-bg-archiv-NOC.png
deleted file mode 100755
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diff --git a/mamweb/static/images/header-bg-archiv.jpg b/mamweb/static/images/header-bg-archiv.jpg
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deleted file mode 100644
index 32870431..00000000
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diff --git a/mamweb/static/images/header-bg-clanek-NOC.jpg b/mamweb/static/images/header-bg-clanek-NOC.jpg
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index 00000000..29077929
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diff --git a/mamweb/static/images/header-bg-odevzdat-NOC.jpg b/mamweb/static/images/header-bg-odevzdat-NOC.jpg
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diff --git a/mamweb/static/images/header-bg-soustredeni-NOC.jpg b/mamweb/static/images/header-bg-soustredeni-NOC.jpg
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diff --git a/mamweb/static/images/header-bg-uvod-NOC.jpg b/mamweb/static/images/header-bg-uvod-NOC.jpg
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diff --git a/mamweb/static/images/header-bg-zadani-NOC.jpg b/mamweb/static/images/header-bg-zadani-NOC.jpg
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diff --git a/mamweb/static/images/header-bg.jpg b/mamweb/static/images/header-bg.jpg
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