A tool for web page objects and image details?

I have an asp page that contains a lot of data, images and objects -- and I want to k开发者_运维百科now the size and the weight of those images and objects.

Is there any tool that can give me these kinds of details?

You can use YSlow in Firefox (and maybe other browsers); it will give you the info you need, separated by type. It also gives lots of information regarding cache usage and good practices

You might also try Fiddler. It tell you the size (in bytes) of each script, image, css, html, etc loaded during a particular page load.