How to add a background image that doesn't juggle while scrolling in IE?

[shinnokdrako]

Hello,

i need to put an image as a background of my shop (version 1.5.6.0). I added these lines in the global.css of the default theme:

#header, #columns, #footer {background:#FFFFFF}
body {
height: 100%;
background-image: url('http://www.olio-di-argan.com/shop/themes/default/img/images/201649164646948_sirmione-per-single-7-1024x768.jpg')!important;
background-attachment: fixed;
background-image: no-repeat;
background-position: center center;
background-size: cover;
}

This code is the result of many tries and suggestions by users from other forums. And in google Chrome (or Firefox etc) works perfectly or at least it seems so ^^'' The real problem is Internet Explorer. When i use it and i scroll with the mouse wheel, the background "juggles". You can see yourself what i mean:

http://www.olio-di-argan.com/shop/

That thing is very annoying and i checked around for possible solutions but nothing helps me. What can i do? I read it's a IE bug, one among the others. Is it possible to fix it? Or is there a plugin that adds the background? I saw a free one but the background wasn't fixed and i need it fixed.

Anyone can help me please?

Thanks in advance.

[shinnokdrako]

Anyone can help me please? I checked again around but i can't find a solution

It has something to do with the scroll event when you use the mouse wheel but i have no idea what to change.