how do i set value of a textbox using javascript

I am trying to get a value fro query string and assign that value into a textbox. I am able to get the value from query string but unable to assign it to textbox.

document.getElementByName('Contact0Email').Value = email;

Tried the above code but doesn't seem to be working. Though the alert of email 开发者_Python百科gives the right value.

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You need a lower-case value and a plural Elements:

document.getElementsByName('Contact0Email')[0].value = email;

You need the [0] to get the first element in the list. Names don't have to be unique like ids.