I created a  very simple web form page in visualforce.
Page with few fields and submit button
I associated that page with my client website.
But when was testing it.
it says authorization error.
	
**Authorization Required 
You must first log in or register before accessing this page. 
If you have forgotten your password, click Forgot Password to reset it.** 

And my question is I want that page to open for public who ever access it don't need to login just enter data and hit save that's it.
Because they are placing this page url in their website.

Is there any way for this.
Please help!.
Thanks.