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This is the guide on how to Getting-the-Form-iFrame-Code
If this is the form http://www.jotform.com/33184281417857 you were referring to, then its iframe embed code should be this.
http://pastie.org/8485189 (you can copy the code from pastie)
Please inform us if you need further assistance.
This is the error when I click on preview or when I paste the code in my html web page.Invalid Form URLThis form is not available for this domain.