when you use geoserver to show your layer map ,you have to get openlayer.js include ol.js and ol.css to finish your own function to view a map.This is a sample which use geoserver and openlayer

Filename	Size	Update
index.html	2102	2014-02-07
OpenLayers.js	945828	2010-09-09
style.css	2594	2014-01-04
images\header_bg.jpg	8607	2013-03-11
img\blank.gif	42	2006-08-25
img\cloud-popup-relative.png	4067	2011-08-08
img\drag-rectangle-off.png	1024	2011-02-25
img\drag-rectangle-on.png	1041	2011-02-25
img\east-mini.png	342	2011-02-25
img\layer-switcher-maximize.png	405	2011-02-25
img\layer-switcher-minimize.png	220	2011-02-25
img\marker-blue.png	758	2011-02-25
img\marker-gold.png	703	2011-02-25
img\marker-green.png	753	2011-02-25
img\marker.png	601	2011-02-25
img\measuring-stick-off.png	3028	2011-02-25
img\measuring-stick-on.png	3725	2011-02-25
img\north-mini.png	378	2011-02-25
img\panning-hand-off.png	3511	2011-02-25
img\panning-hand-on.png	3565	2011-02-25
img\slider.png	247	2011-02-25
img\south-mini.png	373	2011-02-25
img\west-mini.png	360	2011-02-25
img\zoom-minus-mini.png	291	2011-02-25
img\zoom-plus-mini.png	386	2011-02-25
img\zoom-world-mini.png	882	2011-02-25
img\zoombar.png	350	2011-02-25
lib\Firebug\errorIcon.png	457	2007-06-11
lib\Firebug\firebug.css	3480	2007-06-11
lib\Firebug\firebug.html	651	2008-02-08
lib\Firebug\firebug.js	19180	2008-02-08
lib\Firebug\firebugx.js	384	2011-02-25
lib\Firebug\infoIcon.png	524	2007-06-11
lib\Firebug\license.txt	1561	2007-06-11
lib\Firebug\readme.txt	545	2007-06-11
lib\Firebug\warningIcon.png	516	2007-06-11
lib\Gears\gears_init.js	3377	2008-09-12
lib\OpenLayers\Ajax.js	19129	2011-08-03
lib\OpenLayers\BaseTypes\Bounds.js	22382	2011-07-29
lib\OpenLayers\BaseTypes\Class.js	4824	2011-08-08
lib\OpenLayers\BaseTypes\Date.js	5013	2011-08-03
lib\OpenLayers\BaseTypes\Element.js	7850	2011-02-28
lib\OpenLayers\BaseTypes\LonLat.js	6247	2011-07-29
lib\OpenLayers\BaseTypes\Pixel.js	3543	2011-02-25
lib\OpenLayers\BaseTypes\Size.js	2085	2011-07-29
lib\OpenLayers\BaseTypes.js	17782	2011-08-03
lib\OpenLayers\Console.js	7882	2011-02-28
lib\OpenLayers\Control\ArgParser.js	5845	2011-03-07
lib\OpenLayers\Control\Attribution.js	2766	2011-03-07
lib\OpenLayers\Control\Button.js	1214	2011-01-03
lib\OpenLayers\Control\DragFeature.js	11475	2011-07-23
lib\OpenLayers\Control\DragPan.js	4284	2011-05-30
lib\OpenLayers\Control\DrawFeature.js	6946	2011-06-17
lib\OpenLayers\Control\EditingToolbar.js	2236	2011-05-10
lib\OpenLayers\Control\Geolocate.js	5265	2011-02-25
lib\OpenLayers\Control\GetFeature.js	19977	2011-06-16
lib\OpenLayers\Control\Graticule.js	14012	2011-06-24
lib\OpenLayers\Control\KeyboardDefaults.js	3735	2011-03-08
lib\OpenLayers\Control\LayerSwitcher.js	19688	2011-06-24
lib\OpenLayers\Control\Measure.js	12201	2011-02-24
lib\OpenLayers\Control\ModifyFeature.js	30922	2011-08-24
lib\OpenLayers\Control\MouseDefaults.js	11487	2011-04-03
lib\OpenLayers\Control\MousePosition.js	4957	2011-03-07
lib\OpenLayers\Control\MouseToolbar.js	14394	2011-04-03
lib\OpenLayers\Control\Navigation.js	9581	2011-05-09
lib\OpenLayers\Control\NavigationHistory.js	13516	2011-01-03
lib\OpenLayers\Control\NavToolbar.js	1833	2011-05-10
lib\OpenLayers\Control\OverviewMap.js	26674	2011-02-25
lib\OpenLayers\Control\Pan.js	3267	2011-02-02
lib\OpenLayers\Control\Panel.js	13430	2011-06-16
lib\OpenLayers\Control\PanPanel.js	2575	2011-02-02
lib\OpenLayers\Control\PanZoom.js	7095	2011-03-06
lib\OpenLayers\Control\PanZoomBar.js	13374	2011-03-29
lib\OpenLayers\Control\Permalink.js	8063	2011-06-24
lib\OpenLayers\Control\PinchZoom.js	5906	2011-03-10
lib\OpenLayers\Control\Scale.js	2854	2011-06-24
lib\OpenLayers\Control\ScaleLine.js	6667	2011-03-07
lib\OpenLayers\Control\SelectFeature.js	20289	2011-07-29
lib\OpenLayers\Control\SLDSelect.js	21746	2011-03-22
lib\OpenLayers\Control\Snapping.js	21752	2011-02-28
lib\OpenLayers\Control\Split.js	19981	2011-02-28
lib\OpenLayers\Control\TouchNavigation.js	5214	2011-06-21
lib\OpenLayers\Control\TransformFeature.js	22211	2011-05-09
lib\OpenLayers\Control\WMSGetFeatureInfo.js	18995	2011-06-16
lib\OpenLayers\Control\WMTSGetFeatureInfo.js	13104	2011-06-16
lib\OpenLayers\Control\ZoomBox.js	3443	2011-01-03
lib\OpenLayers\Control\ZoomIn.js	934	2011-01-03
lib\OpenLayers\Control\ZoomOut.js	939	2011-01-03
lib\OpenLayers\Control\ZoomPanel.js	1814	2011-01-03
lib\OpenLayers\Control\ZoomToMaxExtent.js	1123	2011-01-03
lib\OpenLayers\Control.js	11501	2011-07-14
lib\OpenLayers\Events.js	28341	2011-05-11
lib\OpenLayers\Feature\Vector.js	17842	2011-07-04
lib\OpenLayers\Feature\WFS.js	2563	2011-01-03
lib\OpenLayers\Feature.js	6514	2011-03-30
lib\OpenLayers\Filter\Comparison.js	9419	2011-04-05
lib\OpenLayers\Filter\FeatureId.js	2345	2011-03-29
lib\OpenLayers\Filter\Function.js	1430	2011-03-17
lib\OpenLayers\Filter\Logical.js	3420	2011-01-03
lib\OpenLayers\Filter\Spatial.js	3749	2011-01-03

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