Login from own web page

Login from own web page

I am trying to login to Manage Engine SDP from my own web page by posting the username and password using the method on the ME website. I am not able to and it is always telling me my username and password are wrong. Below is the code that I am using

<form action="http://servicedesk/HomePage.do" method="post">
   Username<input type="text field"
 name="username"/><br>
 Password<input type="password"
 name="password"/>
 <br><input type="submit" value="Go"/>
 </form>

I guess I need to also include the Domain Name as we use AD authentication but cant find how to do that.

Any help is appreciated