ie6 bug smooth corners

[subwayslim]

HI,

I have this box with smooth corners, it works ok in FF and Ie7 but (guess what?!) it doesn't work in IE6! the top left corner and the bottom right corner don't get showed.

this is the link for it, hope you can help!!
http://www.subwayslims.co.uk/ie_box.html

[Coyotelab]

Read This Tutorial (http://woork.blogspot.com/2007/12/liquid-layer-with-rounded-corners-using.html)

[Coyotelab]

Liquid layer with rounded corners using css
Original Tutorial by Antonio Lupetti
CSS............................................
div.w1{background:#DFDFDF url(pic/w_left_top.gif) no-repeat; width:100%;}
div.w2{background:url(pic/w_right_top.gif) no-repeat top right;}
div.w3{background:url(pic/w_left_bottom.gif) no-repeat left bottom;}
div.w4{background:url(pic/w_right_bottom.gif) no-repeat right bottom; padding:10px;}
..................................................
HTML
..................................................
<div class="w1">
<div class="w2">
<div class="w3">
<div class="w4">
Welcome on my site
</div>
</div>
</div>
</div>