_opacity.less

/**
 * less css: OPACITY
 * 
 * Collection of common lesscss mixins to create cross browser css3 rules. 
 * Rules are mainly gathered from http://css3please.com and http://net.tutsplus.com/tutorials/php/how-to-squeeze-the-most-out-of-less
 * And are re-written to lesscss mixins (http://lesscss.org)
 *
 * @section		lesscss-mixins
 * @subsection	opacity
 * @author      Jasper Moelker <J.B.Moelker@ActiveIDs.nl>
 */

/**
 * @function 	.opacity
 * @param   	{Number}  opacity   expects value between 0 and 1
 * @return                      	cross browser opacity
 */
.opacity(@opacity){
    -moz-opacity: @opacity;
         opacity: @opacity;
}

/**
 * extended opacity rule with IE filter (http://freestyle-developments.co.uk/blog/?p=400)
 * @function 	.opacityFilter
 * @param  		{Number}  opacity   expects value between 0 and 1
 * @return                      	cross browser opacity with IE filter
 */
.opacityFilter(@opacity){
    @ieOpacity: @opacity * 100;
      -ms-filter: ~"progid:DXImageTransform.Microsoft.Alpha(Opacity=@{ieOpacity})"; // IE 8
          filter: ~"alpha(opacity=@{ieOpacity})";                                   // IE 5-7
    -moz-opacity: @opacity;
         opacity: @opacity;
}