I'm not sure what else I should put into the question, so please let me know if I need to add something else.
(form and main page are in the same domain)
var ifr = document.getElementById( yourIframeId ); var ifrDoc = ifr.contentDocument || ifr.contentWindow.document; var theForm = ifrDoc.getElementById( yourFormId );
Or you could have some code in the frame that sets a variable in
parent to the form, but I wouldn't trust that method.
If your iframe has a
name attribute, that can be used as a window name. If the frame name is "myframe":
myframe.document.getElementById("myform") // gives you the form element
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