Shopping Cart Min Order Problem

I have a php shopping cart that I am editing that someone else developed.  My php skills are still very beginner.  Currently the customer must order  $500 to place an order if their cart contains less they get a message  - order must be $500. 

They want this to change so that any items that are in the categories of (accessories, scarves and jewelry) ONLY have a min order total of $150 but ALL other items in the other categories STILL have a min order total of $500. 

So in summary

I need it to check if there are any items in accessories, scarves and jewelry - the total of those items OLY needs to be $150 if not a message needs to be displayed "boutique items have $150 min order."

Then I need it to check all other items in the cart and those items ONLY need to total $500 or a message needs to be displayed "$500 min order required".

There is a lot of other code mixed in with the current orderDetails page about coupons, etc which is throwing me off a little.  I have attached a copy of orderDetails page so you could have all the code.  I have also attached a screenshot of the cart page since it is unavailble for viewing unless you have a login.

Thanks for the help.  I need to get this fixed ASAP...I have gotten close a few times but just can not get it exact.