Code:
    http://www.silkfabricwholesale.com/silk-charmeuse/16mm-silk-charmeuse-fabric-red.html
i using http://leanmodal.finelysliced.com.au/ to popup a window. now, i do the effect as the instruction told. but when i click `With Close Button` which on the right of the "add to cart" button.

i can't filled something to the popup form. although i change the z-index value of the window. why?

the header.fixed lay covers the top of the popup window, although i change the z-index value of header.fixed lay.it isn't covered by the popup window.how to set all these lay z-index?
thank you.

@ralph.m