How come my setCenter doesn't work?

I'm trying to get my map to re-orient to a new center when a user chooses a district within the main map from a dropdown menu. See the map here: http://bilware.net/BullyMap/BullyMap.html

I can get the zoom to change using map.setZoom (although it's commented out below). But map.setCenter won't work. I thought it was because I wasn't calling LatLng parameters correctly, but discovered it won't work even if I plug in fixed parameters, as I think I've done below.

I'm very new to this; any help is appreciated.

function changeMap() {
var selected_bully_table = $('#map_menu').val();
var searchString = document.getElementById('searchString').value.replace("'", "\\'");
if(searchString == "") {
  layer.setQuery("SELECT开发者_StackOverflow 'geometry' FROM " + selected_bully_table);
  return;
  }
layer.setQuery("SELECT 'geometry' FROM " + selected_bully_table + " WHERE 'SDNAME' = '" + searchString + "'");

// Now zoom and center the map
{
map.setZoom(9);
myLatLng=(-91.9240850749,47.9119132072);
map.setCenter(myLatLng);
 }   
}

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Replace

myLatLng=(-91.9240850749,47.9119132072);

with

myLatLng= new google.maps.LatLng(-91.9240850749,47.9119132072);

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your latitude value should be between -90 degrees and +90 degrees and also you should pass a new instance of google.maps.LatLng class to the setCenter function.

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A combination of the two other answers will give you your real answer.

The reason doing

myLatLng= new google.maps.LatLng(-91.9240850749,47.9119132072);

gives you a gray screen is because the position is outside of the bounds of the map. If you zoom out and scroll the map upwards you will see this :)

What you need to do is write

map.setZoom(9);
myLatLng = new google.maps.LatLng(LATITUDE,LONGITUDE);
map.setCenter(myLatLng);

and pass values of LATITUDE & LONGITUDE that are within the bounds of the map like (51, 0).