[PinkMilk]

No JS needed this can be done with CSS only:

This would go in the "Additional CSS Definitions" section near the bottom of style manager

/* faded 50% by default */
img {
 -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=50)";
filter: alpha(opacity=50);
 -moz-opacity: 0.5;
 -khtml-opacity: 0.5;
 opacity: 0.5;
}
/* on hover 100% */
img:hover {
 -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
 filter: alpha(opacity=100);
 -moz-opacity: 1;
 -khtml-opacity: 1;
 opacity: 1;
}

To be more specific you could work out localized image ids/classes (if they have any) or add your own, such as Reply and Closed buttons in SHOWTHREAD template I add the class highlighted in red:

<td class="smallfont"><a href="newreply.php?$session[sessionurl]do=newreply&amp;noquote=1&amp;p=$FIRSTPOSTID" rel="nofollow">
<if condition="$show['closethread']"><img class="img_op" src="$stylevar[imgdir_button]/reply.gif" alt="$vbphrase[reply]" border="0" />
<else />
<img class="img_op" src="$stylevar[imgdir_button]/threadclosed.gif" alt="$vbphrase[closed_thread]" border="0" />
</if></a>
</td>

Now the CSS code is the same as above but tweaking the top lines to reflect the class added:

img {

to:

img.img_op {

and:

img.img_op:hover {

to:

img.img_op:hover {

Obviously this would be a very time consuming task if you wanted it to effect many images but I just wanted to show you how it could be achieved on a per image basis with no JS.

(sorry for bumping old thread)