Flash elements layering above content

A problem we recently encountered is when absolutely positioning a div (in our case a tooltip) over Flash content is that any z-index definitions are ignored, and the Flash content appears as though it’s overlaid above our tooltip. After some searching it turns out that Flash assumes a z-index of infinity, however by setting a wmode value of “opaque”  or “transparent” will fix this.

This can seem a little obvious but could potentially save someone out there some time and stress!