Fieldsets not work properly in IE6?

So I have a form consisting of several nested fieldsets (well, 2 level deep), as in:

 

 --Here is outer fieldset----------------------

|                                                                         |

|     --Here is inner fieldset -------------          |

|    |                                                            |        |

|    |                                                            |        |

|    --------------------------------------------            |

---------------------------------------------------------

 

My fieldsets display great in Firefox and Chrome, but the upper border on both fieldsets is missing when I view it with IE6! Anyone know what I need to modify in the .css to make it work for IE6 too??

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