Open fisubsilver.css and add at the bottom
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.imgfade{filter:alpha(opacity=50); -moz-opacity:0.5;margin-left:3px}
.imgfull{filter:alpha(opacity=100); -moz-opacity:1;margin-left:3px}
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Open fisubsilver.cfg and find
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$folderbig_ih = '25';

$images['icon_quote'] = "$current_template_images/{LANG}/icon_quote.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgtopic";
$images['icon_edit'] = "$current_template_images/{LANG}/icon_edit.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgtopic";
$images['icon_search'] = "$current_template_images/{LANG}/icon_search.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgtopic";
$images['icon_profile'] = "$current_template_images/{LANG}/icon_profile.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgtopic";
$images['icon_pm'] = "$current_template_images/{LANG}/icon_pm.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgtopic";
$images['icon_email'] = "$current_template_images/{LANG}/icon_email.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgtopic";
$images['icon_delpost'] = "$current_template_images/{LANG}/icon_delete.gif\" width=\"$icon_iw\" height=\"$icon_ih\" class=\"imgtopic";
$images['icon_ip'] = "$current_template_images/{LANG}/icon_ip.gif\" width=\"$icon_iw\" height=\"$icon_ih\" class=\"imgtopic";
$images['icon_www'] = "$current_template_images/{LANG}/icon_www.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgtopic";
$images['icon_icq'] = "$current_template_images/{LANG}/icon_icq_add.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgtopic";
$images['icon_aim'] = "$current_template_images/{LANG}/icon_aim.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgtopic";
$images['icon_yim'] = "$current_template_images/{LANG}/icon_yim.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgtopic";
$images['icon_msnm'] = "$current_template_images/{LANG}/icon_msnm.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgtopic";
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Replace with
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$folderbig_ih = '25';
$ifade = 'onmouseover="this.className='imgfull'" onmouseout="this.className='imgfade'';

$images['icon_quote'] = "$current_template_images/{LANG}/icon_quote.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgfade\" " . "$ifade";
$images['icon_edit'] = "$current_template_images/{LANG}/icon_edit.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgfade\" " . "$ifade";
$images['icon_search'] = "$current_template_images/{LANG}/icon_search.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgfade\" " . "$ifade";
$images['icon_profile'] = "$current_template_images/{LANG}/icon_profile.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgfade\" " . "$ifade";
$images['icon_pm'] = "$current_template_images/{LANG}/icon_pm.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgfade\" " . "$ifade";
$images['icon_email'] = "$current_template_images/{LANG}/icon_email.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgfade\" " . "$ifade";
$images['icon_delpost'] = "$current_template_images/{LANG}/icon_delete.gif\" width=\"$icon_iw\" height=\"$icon_ih\" class=\"imgfade\" " . "$ifade";
$images['icon_ip'] = "$current_template_images/{LANG}/icon_ip.gif\" width=\"$icon_iw\" height=\"$icon_ih\" class=\"imgfade\" " . "$ifade";
$images['icon_www'] = "$current_template_images/{LANG}/icon_www.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgfade\" " . "$ifade";
$images['icon_icq'] = "$current_template_images/{LANG}/icon_icq_add.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgfade\" " . "$ifade";
$images['icon_aim'] = "$current_template_images/{LANG}/icon_aim.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgfade\" " . "$ifade";
$images['icon_yim'] = "$current_template_images/{LANG}/icon_yim.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgfade\" " . "$ifade";
$images['icon_msnm'] = "$current_template_images/{LANG}/icon_msnm.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgfade\" " . "$ifade";
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Find
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$images['pm_quotemsg'] = "$current_template_images/{LANG}/icon_quote.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgtopic";
$images['pm_editmsg'] = "$current_template_images/{LANG}/icon_edit.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgtopic";
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Replace with
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$images['pm_quotemsg'] = "$current_template_images/{LANG}/icon_quote.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgfade\" " . "$ifade";
$images['pm_editmsg'] = "$current_template_images/{LANG}/icon_edit.gif\" width=\"$topic_iw\" height=\"$topic_ih\" class=\"imgfade\" " . "$ifade";
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Open viewtopic_body.tpl and find
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<a href="#top"><img src="templates/fisubsilver/images/icon_up.gif" alt="{L_BACK_TO_TOP}" width="16" height="18" title="{L_BACK_TO_TOP}" class="imgtopic" /></a>
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Replace with
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<a href="#top"><img src="templates/fisubsilver/images/icon_up.gif" alt="{L_BACK_TO_TOP}" width="16" height="18" title="{L_BACK_TO_TOP}" class="imgfade" onmouseover="this.className='imgfull'" onmouseout="this.className='imgfade'" /></a>
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