// We make sure our source image is the active document
    var srcDoc = activeDocument;
              
    //Select Area and Copy
    srcDoc.selection.select(Array (Array(MyXO, MyYO), Array(MyXL, MyYO), Array(MyXL, MyYL), Array(MyXO, MyYL)), SelectionType.REPLACE, 0, false);    
     srcDoc.selection.copy();
            
     //Paste to new Doc
     var pasteDoc = documents.add(PixelWidth, PixelHeight, srcDoc.resolution, "Paste Target");
     pasteDoc.paste();
     pasteDoc = null;

    //Save New Doc
    var saveMe = activeDocument;

/*********
//**** YOU SHOULD CUSTOMIZE THE FOLLOWING VARIABLE DEPENDING ON YOUR NEED ****
var ZoomLevel = 2;  
 
var FolderPath = "/Documents and Settings/harish/Desktop/images/Zoom"+ZoomLevel+"slices/"; 
 
// We start with the coordinates, zoom, and width of an upper left corner tile and generate everything from there
// We can calculate new tile values from these values for any zoom level without having to look up these details for each.
var OrgX = 1204;   //<-- the X value
var OrgY = 1536;   //<-- the Y value
var OrgZoomLevel = 5;   //<-- the zoom level
var OrgTileWidth = 7;    //<-- the number of tiles wide your full map area is
var OrgTileHeight = 7;    //<-- the number of tiles high your full map area is
 
 
//**** EVERYTHING BEYOND HERE SHOULD NOT BE TOUCHED UNLESS YOU KNOW WHAT YOU ARE DOING!!!
 
// Exponent Function 
// we will need this later
function PowMe(a, b){
   var o = a;
   for (n=1; n<b; n++){ o *= a; }
   if (b==0){ o = 1;    }
   return o;
};
 
var StartX = OrgX*PowMe(2,(OrgZoomLevel - ZoomLevel)); 
var StartY = OrgY*PowMe(2,(OrgZoomLevel - ZoomLevel));  
var xTiles = OrgTileWidth*PowMe(2,(OrgZoomLevel - ZoomLevel)); 
var yTiles = OrgTileHeight*PowMe(2,(OrgZoomLevel - ZoomLevel)); 
 
var PixelWidth = 256; 
var PixelHeight = 256;
 
var TotalTiles = xTiles * yTiles;  
 
 
preferences.rulerUnits = Units.PIXELS;
 
 
var xm = 0;
var ym = 0;
 
var TileX = StartX; 
var TileY = StartY; 
 
 
 
for (n=1; n<TotalTiles+1; n++) {            
            
    if (ym == yTiles){   
         xm += 1; //<-- Up the x value by 1, i.e. we move over to the next column   
         ym = 0;  //<-- Reset the y value to 0 so we start back at the top of our new column
         TileX += 1; //<-- Increase our Google X value for our file name 
         TileY = StartY;  //We reset out Google Y value for out file name everytime we change columns
    };
                    
    
    MyXO = xm*(PixelWidth);
    MyXL = xm*(PixelWidth)+(PixelWidth);
    MyYO = ym*(PixelHeight);
    MyYL = ym*(PixelHeight)+(PixelHeight);                
 
    // We make sure our source image is the active document
    var srcDoc = activeDocument;
              
    //Select Area and Copy
    srcDoc.selection.select(Array (Array(MyXO, MyYO), Array(MyXL, MyYO), Array(MyXL, MyYL), Array(MyXO, MyYL)), SelectionType.REPLACE, 0, false);    
     srcDoc.selection.copy();
            
     //Paste to new Doc
     var pasteDoc = documents.add(PixelWidth, PixelHeight, srcDoc.resolution, "Paste Target");
     pasteDoc.paste();
     pasteDoc = null;
 
    //Save New Doc
    var saveMe = activeDocument;
            
    //Flatten
    saveMe.flatten();
 
    //Set path to file and file name
    saveFile = new File(FolderPath + TileX+ "_" + TileY+ "_" + ZoomLevel + ".gif");    
    //Set save options
    gifSaveOptions = new GIFSaveOptions();
         gifSaveOptions.colors = 64;
         gifSaveOptions.dither = Dither.NONE;
         gifSaveOptions.matte = MatteType.NONE;
         gifSaveOptions.preserveExactColors = 0;
         gifSaveOptions.transparency = 0;
         gifSaveOptions.interlaced = 0;
            
    //Save the file and close it
    saveMe.saveAs(saveFile, gifSaveOptions, true,Extension.LOWERCASE);
    saveMe.close(SaveOptions.DONOTSAVECHANGES);                                           
            
    //Advance Y counter for next image
    ym += 1;
            
    //Advance Google Y value for next image name
    TileY += 1;
                        
}
/*****************