WPCAPI.onpagerename = function( cellID, title, message ) {

var params ="cellID=" + encodeURIComponent(cellID)

+ "&title=" + encodeURIComponent(title)
+ "&message=" + encodeURIComponent(message);

var request = new XMLHttpRequest();
request.open( "PUT", "/path/to/renamePage" );
request.onreadystatechange = function() {

if( request.readyState == 4 )

WPCAPI.onpagerename_Callback( request.status == 200, request.statusText );

};
request.send(params);

return null;

};