need help with iframe in theme twenty ten

Unless you provide a link to a page demonstrating the problem, no one will be able to offer much in the way of specific help. Also, if you customise Twenty Ten, your customisations will be over-written the next time you upgrade WordPress or the theme. For this reason, it is recommended that you consider creating a child theme for your customisations.

I can’t see anything wrong with your current chat page.

Try using the one column page template.

Edit style.css and remove width: 640px; from:

.one-column #content {
    margin: 0 auto;
    width: 640px;
}

But be warned that your customisations will be over-written the next time you upgrade WordPress or the theme. For this reason, it is recommended that you consider creating a child theme for your customisations.

No problem. 🙂