Why is my Sidebar not validating?

You’re missing the start <code><li> tag in the form input line. Change the search block to:

<li><h2>Search this Site</h2>
<ul>
<li><form method="get" id="searchform" action="/index.php"><input type="text" onClick="if(this.value=='Search and Enter') this.value='';" value="Search and Enter" name="s" id="s" /></form></li>
</ul>
</li>

Aah. Oh yeah, I forgot kubrick has the form in a separate file.

You can either edit the searchform.php file, or just drop the include to the searchform, and just use the code I posted above. Either way, it should validate.

Like I said, you just gotta find the missing <li>

You have.
<li><h2>Search this Site</h2>
<ul>
<form method="get" id="searchform" action="/index.php">
<input type="text" onClick="if(this.value=='Search and Enter') this.value='';" value="Search and Enter" name="s" id="s" /></form>
The form cannot be in <ul> so after it you need a <li>, which has to be closed after the </form> like
</li>
</ul>

And after that comes the closing for the <li> started before the h2 Search…

I think script attributes are case-sensitive, so you might try changing “onClick” to “onclick”. What I mean is that they work fine in upper or lower case, but need to be lower case to properly validate. Why? I’m not sure.

No problem. 😉 I spent half the day yesterday squashing my own validation errors, so I know how frustrating it can be.