Expression для IE6

html{
   background: url('/0.gif') no-repeat;
   background-attachment: fixed; /*избавляемся от дергания при вертикально прокрутки*/
   }  
#header{
    width: 100%;
    padding: 0.5em 0;
    background-color: #000;
    color: #fff;
    position: fixed;
    top: 0;
    left: 0;
    //position: absolute;
    //top: expression(eval(document.documentElement.scrollTop) + 'px');
   }

#content{
   height:4000px;
   }

<div id="header">Эмуляция fixed</div>
<div id="content">Какой-то контент</div>

#out{
   height:500px;
   display:table-cell;
   vertical-align:middle;
}
        
#centered {
   margin-top: expression(((outer.offsetHeight/2)-parseInt(offsetHeight)/2)&lt;0 ? "0" : (centered.offsetHeight/2)-(parseInt(offsetHeight)/2) +'px');
}

<div id="out">
   <p id="centered">...</p>
</div>

   body{
      filter: expression(document.execCommand("BackgroundImageCache", false, true));
   }

   #container
   {
       min-width: 600px;
       max-width: 1200px;
       width:expression(document.body.clientWidth < 600? "600px" : document.body.clientWidth > 1200? "1200px" : "auto");
   }

* html img, * html .png{
position:relative;
behavior: expression((this.runtimeStyle.behavior="none")&&(this.pngSet?this.pngSet=true:(this.nodeName == "IMG" && this.src.toLowerCase().indexOf('.png')>-1?(this.runtimeStyle.backgroundImage = "none",
this.runtimeStyle.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + this.src + "', sizingMethod='image')",
this.src = "transparent.gif"):(this.origBg = this.origBg? this.origBg :this.currentStyle.backgroundImage.toString().replace('url("','').replace('")',''),
this.runtimeStyle.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + this.origBg + "', sizingMethod='crop')",
this.runtimeStyle.backgroundImage = "none")),this.pngSet=true)
);
}