So google implemented the iGoogle service: allows you to organize information from different sites all in one page. the info from each site it displayed in its own area. But google allows you to drag each info box and rearange their order. Have you noticed the cool effect google implemented in the drag? it is as if they filter the box so that it apeparspartly transparent. Does anyone know how this is done?
Yes. When you start to drag a box the opacity of the box is changed, simple really. Have a look at the YUI Yahoo, it allows you to do all these things fairly easily.
I think, the object which is clicked for drag and which actually is dragged are different. And that is how they might have introduced the transparent effect.