Just thought that this might help someone's pain. I have a group of objects and I wanted to add an additional object to it, simply by doing this:
jQuery('#divMain img').add('#newImg'); The problem was that in my situation '#divMain img' sometimes already contains '#newImg', and when it does the add function would add a second copy of it, which messed things up further down the line. What I really needed was a way of uniquly adding an object to a selection. A bit of tinkering later and here's the function: jQuery.fn.addUnique = function(selector) { return this.filter(function (index) { return (jQuery(this).get(0) != jQuery(selector).get(0)) }).add(selector); }; You can just call it like this: jQuery('#divMain img').addUnique('#newImg');