Javascript - Uncaught SyntaxError: Unexpected identifier

There are a few problems here. You should use JSLint which is a very good JavaScript quality assurance tool. This will validate your JavaScript and point out any apparent problems.

First:

aircon = "yes"

should be

aircon == "yes"

secondly:

if result = "Lambourghini Aventador")

should be

if (result == "Lambourghini Aventador")

thirdly

result = "some form of SUV"

should be

result = "some form of SUV";

fourthly

refrain from using ==, instead use the JavaScript standard ===

Read why here in this very good Stackoverflow post!