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First you should create a Property Checkpoint for required object.

Then you can use "Exists" property as Tanya suggested.

But sometimes object can be presented (Exists == True) at the page DOM, but not visible.

In this case you should use another property for this element. Investigate all properties in Object Browser. It can be: Visible, VisibleOnScreen or even Height - sometimes developers use Height = 0 to make element invisible on the screen. 

 Hi Nstohl,

Check whether the Checking Whether An Object Exists ( http://smartbear.com/viewarticle/69092/ ) article answers your question.