Getting The Body Tag And Appending The OnUnload Event Programmatically

I have a site with 5000 pages.

I need to add the onbeforeunload event to the body tag of each form. How can i do this programatically using javascript.

i would like to loop through the form, find the body tag append the onbeforeunload event.

(also, i would like to all href's) on each page.

this is what i have so far but it does not bring the body tag or hrefs's

<code>
function GetElementsFromForm()
{
//document.formOne.elementOne
//document.forms[0].elements[0]

[Code]....