From what you have explained, I believe that the reason could be due to the conflict of the jquery scripts loaded. Usually it is advisable to load the jQuery core script in the parent page, if at all there is a need for using different version of jQuery in the same page.
Since both the Page and the usercontrol loads the jQuery core(v1.6.2), there could be conflict occurred making the code unresponsive. To solve this , i would suggest two ways which you could try any one.
1) If it is really needed to load the jQuery scripts in both Page and the usercontrol(depends on the compatiblity of the jQuery plugins that you use in the respective page), the you could utilize the No Conflict feature that jQuery provides.
http://api.jquery.com/jQuery.noConflict/[
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2) Try removing the jQuery core script that is loaded in the user control and keep the jquery scripts in the parent page.
I believe second option would be a best one you could try for the scenario.
Suggesstion: I would recommend to move the jQuery core load script to your Master page(since i see the content tag in the page code which you gave). By this the jQuery code APIs will be available for all the content pages that you have in your project. Thus avoiding the conflict.
Try these and let me know if any problem.