With ie9 supposedly becoming a "standards compliant" browser there are two fixes that i have made in my own installation.
sitedirectory/modules/mod_s5_horizontal_accordion/css/s5_horizontal_accordion.css -Line 83
.s5_hor_acc_title_wrap2 {
-webkit-transform: rotate(-90deg);
-moz-transform: rotate(-90deg);
-o-transform: rotate(270deg);
-ms-transform: rotate(360deg);
}
Adding the -ms-transform to properly render the rotated text in ie9
and
line 98:
.s5_hor_acc_slide_number {
width:39px;
font-size:16pt;
text-align:center;
margin-top:10px;
padding-top:10px;
}
Adding the margin and padding to gently nudge the number from the text. You may not need this depending on your resets and template css.
On a side note while you are poking around in the files i would also make the following change.
sitedirectory/modules/mod_s5_horizontal_accordion/s5_horizontal_accordion.php -Line 347
<div style="display:none">
<img alt="" src="<?php echo $url ?>images/slide1.png"></img>
<img alt="" src="<?php echo $url ?>images/slide1.png"></img>
<img alt="" src="<?php echo $url ?>images/slide1.png"></img>
<img alt="" src="<?php echo $url ?>images/slide1.png"></img>
<img alt="" src="<?php echo $url ?>images/slide1.png"></img>
<img alt="" src="<?php echo $url ?>images/slide1.png"></img>
<img alt="" src="<?php echo $url ?>images/slide1.png"></img>
<img alt="" src="<?php echo $url ?>images/slide1.png"></img>
<img alt="" src="<?php echo $url ?>images/slide1.png"></img>
<img alt="" src="<?php echo $url ?>images/slide1.png"></img>
</div>
This one is dependant on the style you chose to use for the slider but using the style shown in the demo there is no reason to call 10 different slide images unless you have made specific images for each slide this will save around 66kb of transefer and 9 requests from the browser, overall saving some time on pageload.
Using the above changes i have no problems in any browser till pre ie7 but my site forces users to update if they are using 6 or below anyhow.
Hope this helps you mdrothert