How Do I Change Entire Element

<div id='hello'>Div Hello</div>

<div id='hello2'>Div Hello2</div>

<div id='hello'>Div Hello</div>

to make it disappear from the page or make it's style as block or none or something(what i mean is to remove that entire div only).

i have tried this on Visual Basic 2010 Express ut it only removes text not entire Div:

        Dim HTML As String
        HTML = "<div id="hello">Div Hello</div>"
        WebBrowser1.Document.Body.InnerHtml = ""

i really appreciate if some one help me please with some code or solution

Thank You.