Unable to view dropdown links on my website

Hi

I have installed ability theme for my website at http://www.iitdreams.com. I have created primary links and within that i have posted page as a child. Eg Primary link--maths--algebra. I can view the maths link in the primary links but the algebra link is not visible in the dropdown, infact no drop down is coming at all.

Also while loading the website it shows a js error.

Please look into the problem