scss is the bestest. (need bleeding edge gem to make functions work)

functions

/* @MIXINS */

@mixin rounded-corners($radius) {
  border-radius: $radius;
  -moz-border-radius: $radius;
  -webkit-border-radius: $radius;
  -khtml-border-radius: $radius;
}

@mixin rounded-top($side, $radius) {
  border-top-#{$side}: $radius;
  -moz-border-radius-top#{$side}: $radius;
  -webkit-border-top-#{$side}-radius: $radius;
  -khtml-border-radius-top#{$side}: $radius;
}

@mixin rounded-bottom($side, $radius) {
  border-bottom-#{$side}: $radius;
  -moz-border-radius-bottom#{$side}: $radius;
  -webkit-border-bottom-#{$side}-radius: $radius;
  -khtml-border-radius-bottom#{$side}: $radius;
}

@mixin hp-opacity($trans) {
  filter: alpha(opactiy=($trans * 100));
  -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opactiy=#{$trans * 100})";
  -moz-opacity: $trans;
  -khtml-opacity: $trans;
  opacity: $trans;
}

@function gray($amt, $opacity:nil){ 
  @if $opacity != nil {
    @return rgba($amt,$amt,$amt,$opacity); 
  } @else {
    @return rgb($amt,$amt,$amt); 
  }
}