Update Hidden Fields

document.forms[0].Update.value='yes';
document.myForm.submit;

in a routine.

I have declared a Hidden field called Update in my form. I have checked before the submit that the value does actually get set, but after Submission the value of Update is empty. I have checked everywhere and this is the only place in the page that this value is set.

Does anybody have any idea why my value is being lost on submit. My form is declared :
<FORM NAME="myForm" action="AgentDetail.asp" method="post">

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Hidden Fields

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