if (/MSIE (\d+\.\d+);/.test(navigator.userAgent)){ //test for MSIE x.x;
 var ieversion=new Number(RegExp.$1) // capture x.x portion and store as a number
 if (ieversion>=8)
  document.write("<link href=http://www.acof.org/style.css rel=stylesheet type=text/css />")
 else if (ieversion>=7)
  document.write("<link href=http://www.acof.org/ie7.css rel=stylesheet type=text/css />")
 else if (ieversion>=6)
  document.write("<link href=http://www.acof.org/ie6.css rel=stylesheet type=text/css />")
 else if (ieversion>=5)
  document.write("<link href=http://www.acof.org/ie6.css rel=stylesheet type=text/css />")
}
else
 document.write("<link href=http://www.acof.org/style.css rel=stylesheet type=text/css />")