Search input default value

Search input default value

Hi all,
I have a site search input box, and if I click inside the edit box, the "Search.." text goes away, I used focus(). If I click to other element on the page it set's back the "Search.." string. I used blur().

And here comes my problem, when I click to the submit button, it starts to search for the "Search.." string. How can I avoid the form to search the default value, and force search for the entered value, and when I click outside of the edit box, the default text may come back?

Thank you