Highlight or delete default 'value' in field on click...

Hi, I'd like to use a default value in my 'Single Line Text' fields, and then when someone clicks in the field have it either select the value for overwriting, or ideally remove it.

The designing I'm working to doesn't have labels you see.. client thinks they are 'messy' :)

I've had a pretty good search around and a read of the docs, but haven't seen a method. I could hack it probably with some JS/JQ but would rather use a built-in method or a tried and tested method if there is one.

Cheers!
Ben

Ok thanks, I didn't get on too well with the script in that link, and settled for this very simple select script until I have time to get a better one working:

jQuery(document).ready(function($) {
$("input.medium, textarea.medium").click(function () {
this.select();
});
});

The option to specify that a default value should validate as 'false' will be a much needed and appreciated feature I think. Many forms have the 'prompt' in the fields these days, for simplicity. Not sure what the standards and semantics guys would say, but from a UI point of view its much more straightforward than labels.