Hi, from what you're describing the issue isn't really to do with this add-on, rather older versions of IE doen't support PNG transparency. There's a couple possible fixes:
1) Try downloading my Round Corners on Anything add-on (http://c5extras.com/add-ons/round-corners/) it has a built in fix for IE so it supports PNG transparency.
2) You can try another script to add support for PNG to IE such ashttp://plugins.jquery.com/project/iepngfix...

As this isn't an issue specifically with my add-on I can't provide free general support, but these 2 links should point you in the right direction.

Best of luck.

JB

Dear JB,
I would like to inform you than on my webside there is a loot of .png files
i.e. logo and all of them are looking fine except the .png from your
application. - haw is this possible?

Best Regadrs
Mack
-----Original Message-----
From: Concrete5 Community
Sent: Thursday, September 08, 2011 10:57 AM
To: mack@orangecountry.co.uk
Subject: Problem with IE: Problem with IE

Can you please clarify what version of IE you're running? Is the problem the png background or the icons being laid out vertically instead of horizontally?

Dear C5 Team,
I'm running version 8 of IE. The problem is the icons .png. The icons laid
horizontally but layout has just 10% of it's original width which couldn't
influent on the quality of the pictures.

Best Regards
Mack

-----Original Message-----
From: Concrete5 Community
Sent: Saturday, September 10, 2011 10:09 AM
To: mack@orangecountry.co.uk
Subject: Problem with IE: Problem with IE

Hi Mack,
I see what you mean by the quality of the PNGs now. The issue is with your site's theme.

Look at this screenshot of the Developer Tools in IE8:
http://screencast.com/t/1VYtcowGth...

The lines with the arrows show where the issue lies. I'd suggest using the Developer Tools in IE (press F12) to troubleshoot CSS issues. The inline transparency attributes (from the ShareThis 3rd party code) is being overridden by your template somewhere.

Hope this helps.

JB

Dear jb1,
thank you for your advice

I removed this part of code:

$("#fixedfooter").css({opacity:<?php echo $contentOpacity;?>});

from template and now it's OK

Best Regards
Mack

-----Original Message-----
From: Concrete5 Community
Sent: Monday, September 12, 2011 8:39 AM
To: mack@orangecountry.co.uk
Subject: Problem with IE: Problem with IE

Great to hear. If you're happy with the support provided, I'd greatly appreciate a positive review in the C5 marketplace:
http://www.concrete5.org/marketplace/addons/static-footer/reviews/...

JB