[jQuery] help with array for flot

[rolfsf]

I'm playing with the flot plugin (http://code.google.com/p/flot/) and
need a little help

I want to take data from a series of text inputs (Quantity/Price
pairs) and plot them when a button is clicked.

I just don't understand enough about javascript and arrays to know how
to make an array from the inputs (I suspect it's simple)

I have this test page, which uses a hardcoded array to draw the graph:
http://www.monkeypuzzle.net/testfiles/jquery/flot/flot-test-1.htm

How do I get from:
                        <table>
                                <tr>
                                        <td>1</td>
                                        <td><input type="text" 
class="qty"></input></td>
                                        <td><input type="text" 
class="price"></input></td>
                                </tr>
                                <tr>
                                        <td>2</td>
                                        <td><input type="text" 
class="qty"></input></td>
                                        <td><input type="text" 
class="price"></input></td>
                                </tr>
                                <tr>
                                        <td>3</td>
                                        <td><input type="text" 
class="qty"></input></td>
                                        <td><input type="text" 
class="price"></input></td>
                                </tr>
                                <tr>
                                        <td>4</td>
                                        <td><input type="text" 
class="qty"></input></td>
                                        <td><input type="text" 
class="price"></input></td>
                                </tr>
                                <tr>
                                        <td>5</td>
                                        <td><input type="text" 
class="qty"></input></td>
                                        <td><input type="text" 
class="price"></input></td>
                                </tr>
                        </table>

to this?:

var d1 = [[5, 10], [10, 15], [20, 20], [30, 25], [40, 25]];

thanks!
rolf