<script language="javascript">
function ToggleUploadType(n,o,e){
e.checked=true;
document.getElementById(n).disabled=false;
document.getElementById(o).disabled=true;
}
</script>

<form method="POST" enctype="multipart/form-data" action="upload.php">
 <input type="radio" onclick="ToggleUploadType('FileBox','UrlBox',this)" value="V1" name="R1" checked><input type="file" id="FileBox" name="UpFile" size="20">
 <br>
 <br>
 <input type="radio" onclick="ToggleUploadType('UrlBox','FileBox',this)" value="V2" name="R1"><input type="text" id="UrlBox" name="UpUrl" size="20" value="http://" dir="ltr" disabled>
 <p><input type="submit" value="Submit" name="B1">
 <input type="reset" value="Reset" name="B2"></p>
</form>