Try PNG filter in IE6.

In a pop-up box with rounded corners, shadow, and translucent shadows, you will surely think of PNG. Yes, there is no such thing as Internet Explorer.

This is generally the case

<Div id = "box" style = "background image, if = IE6 (Add filter)">

<Div id = "boxcenter" style = ""> the content in the pop-up box </div>

</Div>

OK, a translucent pop-up box with a pretty rounded corner shadow is displayed. However, under IE6, you will find that this pop-up box can only be viewed and cannot be played,
The buttons in you cannot capture your mouse events. The cup has happened. You can't use any buttons in it. Why?
This is really hard to say, It is blamed on the private filter of IE6. However, if your PNG image is left blank in the position of boxcenter, that is
If your PNG is an image with only a border, the PNG transparency can be used after a filter is added.

Remember, after adding a filter to the PNG image of the background image, the element can only respond to your mouse at the transparent position of the PNG image.
All are blocked by filters !!!!!

Internet Explorer 6 !!!!!!!!!!!