Opacity Setting

.opacity {
  opacity: 0.5; /* For Newer Mozilla Browsers, Safari, and Opera */
  -moz-opacity: 0.5 /* For Older Mozilla Browsers, like Netscape Navigator */
  -khtml-opacity: 0.5; /* For Older Safari */
  -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(opacity=50)"; /* For IE 8 */
  filter: alpha(opacity=50); /* For IE 6 and IE 7 */
}

var setOpacity = function(element, value) {
  element.style.opacity = value / 100; /* For Newer Mozilla Browsers, Safari, and Opera */
  element.style.MozOpacity = value / 100; /* For Older Mozilla Browsers, like Netscape Navigator */
  element.style.KhtmlOpacity = value / 100; /* For Older Safari */
  element.style.MsFilter = '"progid:DXImageTransform.Microsoft.Alpha(opacity=' + value + ')"'; /* For IE8 */
  element.style.filter = "alpha(opacity=" + value + ")"; /* For IE 6 and IE7 */
};