LessPHP crossbrowser functions

@clear(@side:left) {
     *zoom: 1;
     :after {
         content: '';
         display: block;
         clear: @side;
     }
}
@minHeight(@height) {
     min-height: @height;
     _height: @height;
}
@inlineBlock(@moz: -moz-inline-box) {
     display: @moz;
     display: inline-block;
     *display: inline;
     *zoom: 1;
}
@collapse() {
     :after {
          content: '';
          display: block;
          height: 1px;
          margin-top: -1px;
     }
     :before {
          content: '';
          display: block;
          height: 1px;
          margin-bottom: -1px;
     }
}
@overflowX(@y: hidden) {
     overflow: @y;
     overflow-x: auto;
     overflow-y: @y;
     overflow: -moz-scrollbars-horizontal;
}
@overflowY(@x: hidden) {
     overflow: @x;
     overflow-y: auto;
     overflow-x: @x;
     overflow: -moz-scrollbars-vertical;
}