>>I created a simple (I thought) javascript function that would allow a DIV block of collapse and expand. It worked once, but as I simplified it more, it stopped working. I have staring at the code for hours, but can not see why it fails.
>>
>>-- See attachment --
>>
>>Can anyone see where I messed up?
>You were making a assignment with the if. Should be:

if (oHeader.style.display === 'block') {
>}

FWIW, if you're doing a lot of this type of DOM manipulation take a look at angular....

It has been awhile since I try modifying this site.

Two questions,
Should I use two '=', or three as your example indicates?
And are literal strings best inclosed in single quotes or double quotes?