ret = c && c.getPropertyValue(prop) || "";
});
+ if ( prop == "opacity" && ret == "" )
+ ret = "1";
+
} else if (elem.currentStyle) {
var newProp = prop.replace(/\-(\w)/g,function(m,c){return c.toUpperCase();});
ret = elem.currentStyle[prop] || elem.currentStyle[newProp];