I used formputxml with javascript
var xml = new XMLHttpRequest();
var url = "http://ip/formputxml?xmldoc="
xml.open("POST", url, false);
xml.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
var xmlcommand = '<Command><Camera><PositionSet command="True"><CameraId>1</CameraId><Pan>'+pan+'</Pan><Tilt>'+tilt+'</Tilt><Zoom>'+zoom+'</Zoom></PositionSet></Camera></Command>';
xml.send(xmlcommand);