html Error

Hi we are trying to pass the W3C validation check but are getting several errors including this one does anyone know how to fix?

Error: An img element must have an alt attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
From line 445, column 990; to line 445, column 1100
rder:0;"> <img src="http://www.angliaclipperservices.com/im ... 0x480r.jpg" style="width: 100%"/> </a>

<img src="http://www.angliaclipperservices.com/im ... 0x480r.jpg" style="width: 100%"/> </a>

replace you tag with

<img src="http://www.angliaclipperservices.com/im ... 0x480r.jpg" alt="blades-logo" style="width: 100%"/> </a>

Brilliant thanks where do I find that?

So I found the template I believe to be in control of this (correct me if im wrong please)

catalog/view/theme/default/template/module/slideshow.tpl

but there is already the alt command there?

<div><a href="<?php echo $banner['link']; ?>"><img src="<?php echo $banner['image']; ?>" alt="<?php echo $banner['title']; ?>" title="<?php echo $banner['title']; ?>" /></a></div>