IE CSS alignment issues

Question

I have the following CSS that i have \"hacked\" with PHP because it doesn\'t align properly in IE7. Is there a better way to do this without resorting to PHP?

Answer 1

#some_div {
     _margin-top:40px; //Only works on IE6
     *margin-top:30px; //Only works on IE7-IE6
      margin-top:20px\9; //Only works on IE8-IE7-IE6
      margin-top:10px; //Works on all others
}