Hi Amanda,
Out of the box, there is no easy way to achieve this. One way you can go about achieving this is by passing a query parameter along to the new page, so for example if you are on http://www.page.com and linked to a separate page you would need to pass a long some sort of parameter in the URL that would tell the new page what to expand, by passing a long the element ID or class. ie: http://www.page.com/newpage?expand=#idofexpandedcontent
The difficulty would come in parsing out the parameter from the URL, and then executing some javascript to expand the appropriate content.
In short, it’s not easily performed with out of the box functionality but it can be achieved with some know how and tweaking.
Thanks,
Evan