Weight of a page /reveal images when scrolling.

Hello, all!
This is my first post in the DW forum, my field of expertise is Photoshop and imaging in general.
A user in the french forum asked several questions that I can't unfortunately answer:
( http://forums.adobe.com/message/4728148#4728148 )
One deals about the total weight of a page, when images are only revealed with a mouseover. I originally pointed the weight/time meter on the bottom of the document panel, but the question is about the total weight with the linked images. (But the actual amount loaded when one reaches the page initially is the one listed, right?)
The second question deals about the fact that she noticed on certain sites that images are revealed/load only when one scrolls down to reach their location in the page. My assumption is that it is done with a script, but I might be totally wrong.
Hoping you can help me help him/her.

For the images that load only when the area is in focus (scroll, for example) she can use Lazyload plug-in. You can get details here: http://www.appelsiini.net/projects/lazyload
For the load shown in status bar of DW, it's 'File Size/ Download Time'. This excludes all 'remote' images. As the name suggests, it only displays the actual 'file' size and objects that have been written into the file and locally linked.

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