That is due old version of jQuery. For example if you use IE9 and you have jQuery older that 1.5.1 (first jquery after IE9 release). Here is the text telling how to setup jQuery to me optimal on your site,(note that you dont have to do all of that if you now how to just update jQuery) :
TEXT:
Good practice is to disable JQuery in all modules and then in index.php of template in head section add manually reference to .
Latest version of jQuery you can download from jquery.com , link is
jqueryui.com/download
.
You can copy files from package to <template folder>/js/
There are 2 script and one css reference:
<link href="<???path???>/jquery-ui-1.x.xx.custom.css" rel="stylesheet" type="text/css" />
<script src="<???path???>/jquery-1.x.x.min.js" type="text/javascript" />
<script src="<???path???>/jquery-ui-1.x.xx.min.js" type="text/javascript"/>
Go to Module manager open module by bodule and whereerver you see "Load JQuery" (this name can differ form case to case ) property disable it.
Then also go to plugin manager and do that also.
Then open index.php of template and check if there is already reference there. If yes you can just modify it to reference new files you downloaded or delete it and put above 3 reference lines in that order as much close to begining of <head> section as it can be.
To chack you have one and only exactly one reference use "View source" option of your browser when you go to your site. js. References can sometimes be in place where module is rendered so you need to check all source. Easiest way is to text-serach "jquery" in page's source.
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