Sorting problem

Hi, I have a problem with sorting HTML <select>
element. Here is my select option values:

1000($59.95)
2000($109.0)
3000($155.0)
4000($201.0)
5000($500.00)
500($249.0)

Always the 500 appears at the bottom.I need to put
"500" at the top.
The values are created by concating two different
variables in the xslt. My xml is sorted and it looks
like this :

<ProductQuantity  qty="500" price="49.95"/>
<ProductQuantity  qty="1000" price="59.95"/>
<ProductQuantity  qty="2000" price="109.0"/>
<ProductQuantity  qty="3000" price="155.0"/>
<ProductQuantity  qty="4000" price="201.0"/>
<ProductQuantity  qty="5000" price="249.0"/>

 How should I go?




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