This is what I am using on my normal html pages...
Right above the '</head>' put the following code:
Then, what ever you are trying to hide for 'x' amount of time (stated in the code above), place between here:
<div id="hid" style="visibility: hidden"> PLACE ALL CONTENT TO HIDE HERE </div>
I wish there were a plugin or something to make this easy for wordpress.
Any help would be appreciated!