Download the freely available Internet Explorer Developer Toolbar, and add the following capabilities to your browser (from the site):

:: Explore and modify the document object model (DOM) of a Web page.
:: Locate and select specific elements on a Web page through a variety of techniques.
:: Selectively disable Internet Explorer settings.
:: View HTML object class names, ID’s, and details such as link paths, tab index values, and access keys.
:: Outline tables, table cells, images, or selected tags.
:: Validate HTML, CSS, WAI, and RSS Web feed links.
:: Display image dimensions, file sizes, path information, and alternate (ALT) text.
:: Immediately resize the browser window to a new resolution.
:: Selectively clear the browser cache and saved cookies. Choose from all objects or those associated with a given domain.
:: Choose direct links to W3C specification references, the Internet Explorer team weblog (blog), and other resources.
:: Display a fully featured design ruler to help accurately align objects on your pages.

via [Michael Swanson’s Blog]