how do i add an ad code into my blog? it is from adgridwork.com
<script type='text/javascript'>
<!--
var sid = '277';
var title_color = '000000';
var description_color = '646360';
var link_color = '7FBE00';
var background_color = 'ffffff';
var border_color = 'dddddd';
src_str = "http://www.mediagridwork.com/p.php?sid="+sid+"&tc="+title_color+"&dc="+description_color+"&lc="+link_color+"&bgc="+background_color+"&bc="+border_color;
document.write("<iframe id='adfrm' name='adfrm' src=" + src_str + " scrolling='no' height='90' width='200' frameborder='0'></iframe>");
//-->
</script>