Hi,
... as you have noticed, IE8 does not have native support for border-radius CSS3 property.
There is a plugin available that can provide round corners for IE8:
CSS3 PIE[
^]
It's quiet easy to use, simply download and link the file PIE.htc from your css:
#yourElement {
border: 1px solid #000;
border-radius: 10px;
}
behavior: url(path/to/pie_files/PIE.htc);
Check out the getting started
guide[
^]
... hope it helps.