jQuery.expr.filters.hidden = function(elem){
var width = elem.offsetWidth, height = elem.offsetHeight,
force = /^tr$/i.test( elem.nodeName ); // ticket #4512
jQuery.expr.filters.hidden = function(elem){
var width = elem.offsetWidth, height = elem.offsetHeight,
force = /^tr$/i.test( elem.nodeName ); // ticket #4512