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?

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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

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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.