Width and Height specifications

When specifiying an image in an HTML document , should the width and heigh be specified?

as a submit:
<input name="save" type="image"   src="images/saveButton.jpg"  width="20" height="10" alt="Save Button" />

or as as a regular image:

<img src="images/SumPaymentTab.jpg" alt="Payment Information" width="888" height="37" />

Or as a link:
<a href="AMbilling.cfm?fpage=menu"><img src="images/EditButton.jpg"
               alt="Edit Billing Information" width="86" height="28" border="0"/></a>

I read this is a "best practice as the Browser reserves space as it loades the page BUT when I change a buuton used in many pages, I don't want to have to change the dimensions?

Thanks in advance,
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nevermind about image dimensions, if you have the images with the proper dimensions.
It isn't required. It can optimize, eventually --- minimizing page load times, but the difference is negligible, if noticeable.

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PS: IMHO, less coding is also optimization: if you don't put the dimensions, that's about 26 characters less for any given image.
hefterrAuthor Commented:
Hi designatedinitializer,
Thanks for the reply.  I'm not sure what you meant by :
>> It can optimize, eventually  ??

what I mean is that it may be true that the browser loads the page a little bit faster if you provide width and height in advance, but I have my doubts.
hefterrAuthor Commented:
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