"Add to Cart" Icon not working

[rghafur]

I'm new to Joomla & VirtueMart and recently installed the following versions:

Joomla 2.5.8
VirtueMart 2.0.18a

I have made some look and feel modifications by adding additional templates and have based the Virtuemart store on the Flexi template, however when I click on "Add to Cart" nothing happens.

Please let me know how I can debug the issue.

The link to the page is : http://www.uni-eng.co.uk/e-store/grilles/double-deflection-grille/double-deflection-grille-150x150mm-detail

Thanks