Form JavaScript Tutorial

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  4. Getting form References
First, use getElementById() and pass in the form's ID:

var oForm = document.getElementById("form1");
Alternately, you can use the document's forms collection and reference the form either by its position in the forms collection or by its name attribute:

var myForm = document.forms[0];               //get the first form
var myOtherForm = document.forms["formZ"];    //get the form whose name is "formZ"