Help reg the Layered Navigation.

Hello,
I am using the layered navigation for the filter the products by the attribute like.
https://www.bluewaterweb.com/index.php/flags/international-flags-2ft-x-3ft.html?area_two=69&area_three=80

There is two attributed area_two and area_three, now it is checking the and condition bitween both attribute.
If some product has assign the area_two=69 and area_three has assign 80 than it is filtering but i want to list the product if there is assign the area_one 69 or area_three 80.

In  short i want to set the OR condition bitween multiple attribute filter.

Thank you.