.sow-image_darken .so-widget-sow-image img {
      filter: gray; /* IE5+ */
      -webkit-filter: grayscale(1); /* Webkit Nightlies & Chrome Canary */
      -webkit-transition: all .3s ease-in-out;
  		opacity: 0.5;
  		-webkit-filter: alpha(opacity=50); /* For IE8 and earlier */
    }

.sow-image_darken .so-widget-sow-image img:hover {
      filter: gray; /* IE5+ */
      -webkit-filter: grayscale(0); /* Webkit Nightlies & Chrome Canary */
  		opacity: 0.9;
    }