javascript - MooTools Plugin Function for Vertical Alignment -


how 1 write plugin function (class?) in mootools can called on set of elements in order vertical align them? have similar function i've used jquery, , looks this: 

  $.fn.valign = function() {     return this.each(function() {       var ah = $(this).height();       var ph = $(this).parent().height();       var mh = (ph - ah) / 2;       $(this).css('margin-top', mh);     });   };

i'm bit @ loss how 1 similar in mootools. proper method create class suggested here? not seem improvement on jquery , seems wrong approach. know right way go this?

following info got tim wienk on irc , github, here practical example of how mootools version like:

element.implement('valign', function () {     var ah = this.getsize().y;     var ph = this.getparent().getsize().y;     var mh = (ph - ah) / 2;     this.setstyle('margin-top', mh); });  $$('div').valign();

example online: http://jsfiddle.net/btcb8/


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