HTML Validation and SERPs - how much of an effect?

I used lots of ID's for CSS formatting and I'm wondering how it affects SEs

[bigtoga]

An exmaple:

<table class="ver-12-blue" id="pos-titleinfo">

When I validate this (using the validator built into Firefox), it generates warnings (not errors - code is error-free) but it maes me wonder if this is bad for SEO.

Is there a tipping-point at which SE crawlers say, "Forget it! He has too many of those silly id="" things on his page - I quit!"? My pages routinely have 30+ warnings in this aspect...

Any thoughts on using class="" and id="" with regard to SEO 9not general CSS design)?

Thanks!

[bigtoga]

bump ^

[bigtoga]

How about I ask a different way - here's the output from TIDY:

Image output from TIDY [whigham.org]

I have these all over my site - some pages have 50+ of these "Warnings" (no errors though). These are caused by things like:

<td width="100%" id="pos-info">

for positioning, CSS, etc

how will this affect the SE crawlers?