Netscape format for "getElementsByTagName"

[chakuli]

Hi
Can someone suggest a Netscape equivalent of the following statement

" window.document.getElementsByTagName("HTML" "

Details :-

I have an application form i.e. Insurance Application. For every user who fill up the form I want to store the page as a text file for future edits. What I did was.... on submit, I got the whole source with current values into a hidden variable (HddnHtml) by using the Javascript command given below.

function FormSubmit(form_index)

var aReturn;
if (ns4)
{ document.layers["Content"].document.forms[form_index].submit(); }
else
{
aReturn = window.document.getElementsByTagName("HTML"
alert(aReturn[0].innerHTML);
document.forms[form_index].Hddnhtml.value = aReturn[0].innerHTML;
document.forms[form_index].submit();
}
}

This works in IE but on Netscape it gives me an error "
document.getElementsByTagName is not a valid function". Please notice the syntax for the submit in Netscape. Any workaround guys.