Is that much important to include the ALT attribution into images?
In HTML authoring, there are very good reasons to include an alt attribute into every IMG element. The purpose is to specify a textual replacement for the image, to be displayed or otherwise used in place of the image. This tag is originally designed for displaying text to those users who have graphics turned off, but now is also getting indexed into the keyword list by many of the big search engines. And, it is a must if your homepage or index page is designed through styles like frame, images, flash etc. that might adversely affect ranking of your site.