Focus And write in webbrowser

when html code like this when i use this code = WebBrowser1.document.Forms(0).document.GetElementById("passwd").InnerText = Textbox1.Text

<input type="password" name=" passwd " value="" style="width:185px;" maxlength="12" onblur="fieldTrack(this);"/>ev
 

now html like this =

<input class="captcha" type="text" name="e67dca54590d5bf48d9e32fba9dee42b"style="width:183px;" value="" onblur="fieldTrackCaptcha(this);"/>ev

name="e67dca54590d5bf48d9e32fba9dee42b"

name is changed every 5 minut so what to do??????


help please