How to add labels to Google Maps (learn latitude and show the location icon)

How does Google Maps add annotations (learn latitude and show the location icon)?
Look at Google's API for a long while not found?
Want to ask a friend you've done?
How does Google Maps add annotations (learn latitude and show the location icon)?

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can go to see our website, hehe www.niaoke.com
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First, Google itself API is provided with (simple)
Second, to Google or MAPABC purchase (full function, charge)
Third, the form of their own hacker (I realized before, but it is said that the interface has changed, so it will not be used, otherwise provided to you for free)

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Do not know what the LZ specifically to do, if it is to take the coordinates,
You can refer to the code here:

HTML Code

      <title>Google Maps JavaScript API example-simple</title>                    
    
  
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$ (' #Label2 '). Click (function () {
Googlemapaddevent (MyMap, "click", Function (marker, point) {
if (marker)
{
Mymap.removeoverlay (marker);

}
Else
{
Mymap.clearoverlays ();
var dmarker = new Gmarker (point, {draggable:true});
var dpoint;
var x;
var y;
x = Googlemappointx (point);
y = Googlemappointy (point);
document.getElementById ("TextBox2"). Value = x;
document.getElementById ("TextBox1"). Value = y;
if (document.getElementById ("Hidsyid"). value== ")//NULL indicates the initial incoming monitoring point code
//                            {
document.getElementById ("HIDW"). Value=x;
document.getElementById ("Hidj"). Value=y;
//                            }
Gevent.addlistener (Dmarker, "DragStart", function () {
});
  
Gevent.addlistener (Dmarker, "Dragend", function () {
Dpoint=dmarker.getpoint ();
Mymap.panto (Dpoint);
x = Dpoint.lat ();
y = dpoint.lng ();
document.getElementById ("TextBox2"). Value = x;
document.getElementById ("TextBox1"). Value = y;
if (document.getElementById ("Hidsyid"). value== ")
//                            {
document.getElementById ("HIDW"). Value=x;
document.getElementById ("Hidj"). Value=y;
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