W3C Validation - how important is it?

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Well, personally, sometimes dealing with validator make me a bit confuse. But, as long as we didn't miss important tags, I think we will not get a huge error. You can see it in you page source.

Try to fix the error step by step. At least for the first three error:

1. You missed the <tr> tag after the <table> tag.
Find this in your forumdisplay or something like that template:

HTML Code

<td valign="top" width="18%">

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You should have <tr> tag before the tag above.

2 and 3. Your image tag in the part above:

HTML Code

<img src="......./bookmarksite.jpg">

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You should add alt attribute in the tag. And self close the tag:

HTML Code

<img src="......./bookmarksite.jpg" alt="" />

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