diff --git a/course/noweeks.php b/course/noweeks.php
index d22b675e460..f360408eb17 100644
--- a/course/noweeks.php
+++ b/course/noweeks.php
@@ -8,7 +8,7 @@
     // Layout the whole page as two big columns.
     echo "<TABLE BORDER=0 CELLPADDING=4>";
     echo "<TR VALIGN=top><TD VALIGN=top WIDTH=200>";
-    echo "<IMG SRC=\"../pix/spacer.gif\" WIDTH=180 HEIGHT=1><BR>";
+    echo "<IMG ALT=\"\" SRC=\"../pix/spacer.gif\" WIDTH=180 HEIGHT=1><BR>";
     
     // Layout the left column
 
@@ -37,7 +37,7 @@
     // Start main column
     echo "</TD><TD WIDTH=100%>";
 
-    echo "<P><IMG SRC=\"../pix/spacer.gif\" WIDTH=100% HEIGHT=3><BR>";
+    echo "<P><IMG ALT=\"\" SRC=\"../pix/spacer.gif\" WIDTH=100% HEIGHT=3><BR>";
     echo "<TABLE BORDER=0 CELLPADDING=0 CELLSPACING=0 WIDTH=100%>";
     echo "<TR>";
     echo "<TD NOWRAP ALIGN=RIGHT><P><FONT SIZE=1>";
diff --git a/course/social.php b/course/social.php
index 81a2c693410..3eefc613e66 100644
--- a/course/social.php
+++ b/course/social.php
@@ -80,7 +80,7 @@
       }
       $headertext = "<TABLE BORDER=0 WIDTH=100% CELLPADDING=0 CELLSPACING=0><TR><TD>Social Forum - Current Topics<TD ALIGN=RIGHT><FONT SIZE=1><A HREF=\"../mod/discuss/subscribe.php?id=$social->id\">$subtext</A></TD></TR></TABLE>";
          print_simple_box("$headertext", $align="CENTER", $width="100%", $color="$THEME->cellheading"); ?>
-      <IMG HEIGHT=7 SRC="../pix/spacer.gif"><BR>
+      <IMG ALT="" HEIGHT=7 SRC="../pix/spacer.gif"><BR>
 
       <? 
           if ($social = get_course_social_forum($course->id)) {
diff --git a/course/weeks.php b/course/weeks.php
index 68fddb89116..5bd19dc9201 100644
--- a/course/weeks.php
+++ b/course/weeks.php
@@ -19,7 +19,7 @@
     // Layout the whole page as three big columns.
     echo "<TABLE BORDER=0 CELLPADDING=4>";
     echo "<TR VALIGN=top><TD VALIGN=top WIDTH=180>";
-    echo "<IMG SRC=\"../pix/spacer.gif\" WIDTH=180 HEIGHT=1><BR>";
+    echo "<IMG ALT=\"\" SRC=\"../pix/spacer.gif\" WIDTH=180 HEIGHT=1><BR>";
     
     // Layout the left column
 
@@ -69,7 +69,7 @@
     echo "</TD><TD WIDTH=\"*\">";
 
     echo "<TABLE WIDTH=100% CELLSPACING=0 CELLPADDING=0><TR><TD>";
-    echo "<P><IMG SRC=\"../pix/spacer.gif\" WIDTH=100% HEIGHT=3><BR>";
+    echo "<P><IMG ALT=\"\" SRC=\"../pix/spacer.gif\" WIDTH=100% HEIGHT=3><BR>";
     echo "<B><FONT SIZE=2>Weekly Outline</FONT></B>\n";
     
     echo "</FONT>";
@@ -144,7 +144,7 @@
         echo "</TD>";
         echo "<TD NOWRAP BGCOLOR=\"$highlightcolor\" VALIGN=top>&nbsp;</TD>";
         echo "</TR>";
-        echo "<TR><TD COLSPAN=3><IMG SRC=../pix/spacer.gif WIDTH=1 HEIGHT=1></TD></TR>";
+        echo "<TR><TD COLSPAN=3><IMG ALT=\"\" SRC=\"../pix/spacer.gif\" WIDTH=1 HEIGHT=1></TD></TR>";
 
         $week++;
         $weekdate = $nextweekdate;