Hi There,
I'm a Joomla developer with more than 5 years of experience and I'm familiar with virtuemart, I've also customized virtuemart.
You are right first issue is related to js.
And second issue can be resolved easily.
I can initiate the project as soon as it is awarded & you can pay once your project is completed & delivered to you.
Also, I'm comfortable with the budget mentioned in description.
Looking forward to work with you!