Great web part for collapsing web part contents
You import the webpart to the bottom of the page, (or create a content editor web part and paste the script, hide the chrome)
Then, create a new web part (I've created a new CEWP and used chrome as question and body as answer for FAQ look page), or use one you already have.
Remember, for auto collapsing at page load, go to webpart properties, apearance, chrome state, "Minimized"
You can download & import the dwp
CollapseWPs dwp WebPart
or create it yourself and add the script to the CEWP's source