iframe : handle onkeypress event

**first code** var my_iframe = document.getElementById("my_iframe"); my_iframe.contentDocument.head = ""; my_iframe.contentDocument.body = ""; Giving me an error `my_f` undefined function. As I have inspected html element in firebug, found that **my_f function** is defined in javascript tag inside the head of iframe. could someone guide me, how can handle onkeypress event on input here inside iframe. And what is wrong here? ------------------ **second code** :: this worked: my_iframe.contentDocument.body = ""; but question here is what is the problem in **first code**;
should be

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