search form onclick error

So I’m trying to enact this:

http://www.namepros.com/code/70930-very-cool-javascript-function-alternative-onclick.html

on my site’s search bar: http://thespoke.t2j.us/

problem is, general-template.php doesn’t like: onclick="this.value=''"

So when I put it in like so:

<input type="text" onclick="this.value=''" value="SEARCH THIS SITE...' . esc_attr(apply_filters('the_search_query', get_search_query())) . '" name="s" id="s" />

I get the following error:
Parse error: syntax error, unexpected T_CONSTANT_ENCAPSED_STRING in /home/lonick/public_html/clients/thespoke/wp-includes/general-template.php on line 126

So what’s going on here? and how would I incorporate the javascript needed from the first link.

thanks