v154 Uncaught ReferenceError: jQuery is not defined,Cannot read property 'style' of null

Hi all,i check my site :www.targetmarts.com ,i hope to find out all error and any mistake for speed.
and now i can see there have error from js:
jscript_menu_conf.js:58 Uncaught ReferenceError: jQuery is not defined
jscript_random.js:13 Uncaught ReferenceError: jQuery is not defined
jscript_imagehover.js:52 Uncaught TypeError: Cannot read property 'style' of null

and i can see some other url (like ads) , can you help me where and witch files from my site?
Attachment 17850

Thanks