Automate Entering Information Onto A Printer Web Interface?

im trying to automate entering information onto a printer web interface. I was sucessfully in creating a problem for one particular model printer but not another(differnet manufactor).

HTML button code:

<input type="button" class="w10pt" style="width:136px;display:block;font-weight:700;" value="Login" onclick="location.href='/start/login.htm?arg1=1'">

I tried:

theElementCollection = WebBrowser1.Document.GetElementsByTagName("input")
For Each curElement As HtmlElement In theElementCollection
If curElement.GetAttribute("value").Equals("Login") Then[code].....

it doesnt work .I read this in another post:

"There are several possible approaches; you can try to identify something other than the id, such as the element's name, class, tag name, etc. Another approach is to identify a nearby element, whether it's a sibling, child, parent, etc. that is easily identified (it has an id, or is in some other way unique) and get to the element that you want relative to the element you know you can find. For example, maybe the element is the only child of a </div> tag or a </span> tag that does have an id." So this is the parent to that code:

<div align="center" style="padding:5px;border-style:solid;background:#ccc;border-color: #000;border-width:1px 1px 0px 1px;"><input type="button" class="w10pt" style="width:136px;display:block;font-weight:700;" value="Login" onclick="location.href='/start/login.htm?arg1=1'"></div>[code].....

The site has other buttons that i need to click, so if i can figure this one hopefully i will be able to get the other ones.