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Why not do it this way?

Submitted by Anonymous on Tue, 03/16/2010 - 10:43.

asp:Button ID="btnFinish" Text="Finish" OnClick="btnFinish_Click" OnClientClick="window.setTimeout('disableFinishButton()',0); return true" runat="server"

script type="text/javascript"
function disableFinishButton()
{
var arrInputs = document.getElementsByTagName('INPUT')

for (var i = 0; i < arrInputs.length; i++)
{
if (arrInputs[i].getAttribute('id') != null)
{
if (arrInputs[i].getAttribute('id').indexOf('btnFinish') > -1)
{
arrInputs[i].disabled = true
break
}
}
}
}
/script

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