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yesterday, I had exactly same problem, I wanted to read some data which is in my iframe, so I understood that is a way for do that, for exampleto read body data in this html code and write in to test field :

we can write this javascript code:

function read() {
var myIFrame = document.getElementById(“url”);
var content =myIFrame.contentWindow;
document.getElementById(“test”).innerHTML = content.document.body.innerHTML;
}

Note1: you can read some special data with ID for example content.document.getElementById(“text1″).innerHTML;

Note2: the contentWindow work on FireFox and google chrome, but for use in IE you should use of contentDocument

Note3: I am not sure that this way work on frame too, but if it doesn’t work, you can use iframe in place of frame

this link can be usefull too: http://roneiv.wordpress.com/2008/01/18/get-the-content-of-an-iframe-in-javascript-crossbrowser-solution-for-both-ie-and-firefox/