using setcenter in javascript

I wan't to use setCenter method in a javascript to interact with a listbox.
At first this code is working fine :

    var ol = jQuery('.openlayers-map').data('openlayers');//assuming there is just one map on the page
    ol.openlayers.zoomTo(9);

But this code isn't working :

    var ol = jQuery('.openlayers-map').data('openlayers');//assuming there is just one map on the page
    var lonLat = new OpenLayers.LonLat(47.678334,-2.590485).transform(new OpenLayers.Projection("EPSG:4326"), ol.openlayers.getProjectionObject());
    ol.openlayers.setCenter(lonLat, 11);

if you search 47.678334,-2.590485 in google maps, you arrive somwhere in the west of france, but my openlayer map is showing a point somewhere near Somalia ;)
Thanks for helping !