How to clear a field on Focus?

Hi again,
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when a field is focused by the user, I want the default value to vanish.
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I tried and entered the following into "extra params" of a text field:

onfocus=if(this.value == 'First name*') { this.value = ''; }

Unfortunately, this didn't work. What's wrong with my syntax?
Thx for showing me a way!
Herbert

The "placeholder" seems to be not documented - so I don't know anything about its purpose. I always use three ways to find out more about ChronoForms before asking stupid questions:
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1. Click on "More info on Chronoengine.com" when editing a field on my site: this opens 404 Error page on Chronoengine.com (since a couple of months - it used to work before a date X).
2. Searching for "placeholder" on Chronoengine FAQs' site: shows empty page (empty page is btw the result of any search term)
3. Searching for "placeholder" with CF5 tag in Chronoengine forum: no results.
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It's a pity that two of three ways don't work properly here. I am sure the info is available here somewhere.
Regard, Herbert

But filling placeholder did the trick. Thx, healyhatman.

No problem. And placeholder is a standard html attribute so I'm not surprised there isn't a page teaching you about it here.

Hi Herbert,
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The Forum search herehas been broken for a while :-( hopefully Max has it on his 'to-do' list to fix it.
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I use Google search which is usually better anyhow. Putting site:chronoengine.com placeholder in my browser takes me to this list of posts and FAQS
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Bob