.opacity{
filter:alpha(opacity=50); /* IE */
-moz-opacity:0.5; /* 老版Mozilla */
khtml-opacity:0.5; /* 老版Safari */
opacity: 0.5; /* 支持opacity的浏览器*/
}
object.filter = "alpha(opacity=" + opacity + ")"; /* IE */
object.MozOpacity = (opacity / 100); /* 老版Mozilla */
object.KhtmlOpacity = (opacity / 100); /* 老版Safari */
object.opacity = (opacity / 100); /* 支持opacity的浏览器*/