IE 8 iframe border

There is a border showing on an iframe and I can't get rid of it.

IE 6 and 7 work as intended with a little JavaScript:

function test(){
    var iframe = document.getElementById('frame2');
    iframe.contentWindow.document.body.style.backgroundColor = "#a31d1d";
    iframe.contentWindow.document.body.style.border = "#a31d1d";
    iframe.contentWindow.document.body.style.outlineColor = "#a31d1d";
}

But the border remains visible in IE 8.