diff --git a/mozilla/webshell/tests/viewer/samples/test10.html b/mozilla/webshell/tests/viewer/samples/test10.html
index d9dee5a7adf..a2446c7df76 100644
--- a/mozilla/webshell/tests/viewer/samples/test10.html
+++ b/mozilla/webshell/tests/viewer/samples/test10.html
@@ -3,14 +3,14 @@
 <meta name="crc" content=90987012>
 </head>
 <BODY Background="gear1.gif">
-<IMG SRC="Anieyes.gif" style="opacity:0.25;" width=150>
-<IMG SRC="Anieyes.gif" style="opacity:0.5;" width=150>
-<IMG SRC="Anieyes.gif" style="opacity:0.75;" width=150>
+<IMG SRC="Anieyes.gif" style="-moz-opacity:0.25;" width=150>
+<IMG SRC="Anieyes.gif" style="-moz-opacity:0.5;" width=150>
+<IMG SRC="Anieyes.gif" style="-moz-opacity:0.75;" width=150>
 <BR>
 <BR>
 <HR>
 <BR>
-<IMG SRC="gear1.gif" style="opacity:0.25;" width=300>
+<IMG SRC="gear1.gif" style="-moz-opacity:0.25;" width=300>
 <BR>
 </BODY>
 </HTML>
diff --git a/mozilla/webshell/tests/viewer/samples/test13.html b/mozilla/webshell/tests/viewer/samples/test13.html
index 89ec0d78165..e92c90ac066 100644
--- a/mozilla/webshell/tests/viewer/samples/test13.html
+++ b/mozilla/webshell/tests/viewer/samples/test13.html
@@ -1,17 +1,17 @@
 <HTML>
 <BODY Background="rock_gra.gif" onload="startit();">
 <DIV style="color:red; position:absolute; top:-40px; left:0px;">
-<!-- <DIV style="opacity:40%; color:red; position:absolute; top:-40px; left:0px;"> -->
+<!-- <DIV style="-moz-opacity:40%; color:red; position:absolute; top:-40px; left:0px;"> -->
 <font point-size=200 face="verdana">
 <b>Red</b>
 </font></div>
 <DIV style="color:darkgreen; position:absolute; top:50px; left:50px;">
-<!-- <DIV style="opacity:40%; color:darkgreen; position:absolute; top:50px; left:50px;"> -->
+<!-- <DIV style="-moz-opacity:40%; color:darkgreen; position:absolute; top:50px; left:50px;"> -->
 <font point-size=200>
 <b>Green</b>
 </font></div>
 <DIV style="color:blue; position:absolute; top:100px; left:100px;">
-<!-- <DIV style="opacity:40%; color:blue; position:absolute; top:100px; left:100px;"> -->
+<!-- <DIV style="-moz-opacity:40%; color:blue; position:absolute; top:100px; left:100px;"> -->
 <font point-size=200 face="comic sans ms">
 <b>Blue</b>
 </font></div>
@@ -105,15 +105,15 @@ function movedivs()
 
 	d[0].style.left = d0x + "px";
 	d[0].style.top = d0y + "px";
-/*	d[0].style.opacity = opac0 + "%";*/
+/*	d[0].style.MozOpacity = opac0 + "%";*/
 
 	d[1].style.left = d1x + "px";
 	d[1].style.top = d1y + "px";
-/*	d[1].style.opacity = opac1 + "%";*/
+/*	d[1].style.MozOpacity = opac1 + "%";*/
 
 	d[2].style.left = d2x + "px";
 	d[2].style.top = d2y + "px";
-/*	d[2].style.opacity = opac2 + "%";*/
+/*	d[2].style.MozOpacity = opac2 + "%";*/
 
 	setTimeout(movedivs, 10);
 }
