+ step: {
+ scrollLeft: function(fx){
+ fx.elem.scrollLeft = fx.now;
+ },
+
+ scrollTop: function(fx){
+ fx.elem.scrollTop = fx.now;
+ },
+
+ opacity: function(fx){
+ jQuery.attr(fx.elem.style, "opacity", fx.now);
+ },
+
+ _default: function(fx){
+ fx.elem.style[ fx.prop ] = fx.now + fx.unit;
+ }