api_xml_http.open( "post", "soap_processor.asp", false );

api_xml_http.setRequestHeader( "Content-Type", "text/xml" );

api_xml_http.setRequestHeader( "SOAPAction", "soapserver/soap:AuthorizationModule#DoLogin" );

api_xml_http.send( "<SOAP:Envelope xmlns:SOAP=\"http://schemas.xmlsoap.org/soap/envelope/\"><SOAP:Header></SOAP:Header><SOAP:Body><m:DoLogin xmlns:m=\"urn:soapserver/soap:AuthorizationModule\"><UserName>a</UserName><Password>a</Password></m:DoLogi n></SOAP:Body></SOAP:Envelope>" )

alert( api_xml_http.responseText );

...