How do I print an IFrame from javascript in Safari/Chrome

Put a print function in the iframe and call it from the parent.

iframe:

function printMe() {
  window.print()
}

parent:

document.frame1.printMe()

Here is my complete, cross browser solution:

In the iframe page:

function printPage() { print(); }

In the main page

function printIframe(id)
{
    var iframe = document.frames
        ? document.frames[id]
        : document.getElementById(id);
    var ifWin = iframe.contentWindow || iframe;

    iframe.focus();
    ifWin.printPage();
    return false;
}

Update: Many people seem to be having problems with this in versions of IE released since I had this problem. I do not have the time to re-investigate this right now, but, if you are stuck I suggest you read all the comments in this entire thread!