Pass data to a web form on another website and get the response

Hi,
Assume the following html form is on http://www.somepostwebsite.com/form1 in which you enter first name and last name and click the button.
<body>
<form id="form1" action="Result1.aspx" method="post" >
    <p>
        First Name:
        <input id="FName" type="text" name="FName" /></p>
    <p>
        Last Name:
        <input id="LName" type="text" name="LName" />&nbsp;&nbsp;&nbsp;
        <input id="Submit1" type="submit ...