JavaScript function to add a string of numbers
<p>Not sure how to word this and so am not having much luck in Google searches...</p>

<p>I need to calculate a value for a string of numbers.</p>

<p>Example.
A user types in "1.00 + 2.00 - 0.50" into a text field. The function should be able to take that string and calculate the result to return $2.50.</p>

<p>Anyone have a way to do this in their bag of tricks?</p>
