fopen on URL which requires POST-vars

In writing a simple robot that works only on user requests which fetches, parses and returns result to the user in text/plain format, I've written a script which fetches an URL using fopen($url,"r"). The basic URL i request, and retrieve is on the form http://address/document.asp?item1=foo&item2=bar Getting the data I want in the get-request is no problem, but there is a form on the page, which will send additional data to the server <form name="foobar" method="post"> <select name="barfight" onchange="sendData(this.form)"> <option value=123>item1</option> <option value=456>item2</option> <option value=789>item3</option> </select> <input type="radio" name="hahaha" value="good"> <input type="radio" name="hahaha" value"bad"> <input type="submit" name="FetchData" Value="Fetch"> </form> Maybe this is my lacking understandig of forms, get and post. But, can I pass the post data, via URL, and in that case, how should the URL be specified, or can I use http-post-vars in some way, when opening the document URL. -- Arve Bersvendsen.