javascript - How to tweak jQuery animation for the element to stay in the middle? -

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i have jquery mobile page , want animate save button on page lose half of width/height , animate original size. 

function animateme() {       var originalheight = $("#btnsave").height();   var originalwidth = $("#btnsave").width();   $("#btnsave").animate(     {"height": originalheight / 2, "width": originalwidth / 2},      { duration: "fast" }   );                $("#btnsave").animate(     {"height": originalheight, "width": originalwidth},      { duration: "fast" }   );                   }

the animation works fine, hoping button collapse middle, instead collapses top/left location (as 1 expect).

how can animate button collapse middle , back?

this better using css3 animation , scale transform, instead of relying on jquery's animate. beside other advantages using css3 animations this, performance should better.

here's rough example, give idea: http://jsfiddle.net/ghinda/8nnes/


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