How to scroll static google map image ?

Hello, I'm new to symbian C++,
how is possible to scroll a google static map image?
So far, i'm downloading a JPG image in the device, than i load it using CImageReader class but i cannot scroll it (i'd need to download another picture).Actually what i do not know is how to get the coordinate of latitude and longitude of the center of the new static map that i have to download.I got a code to adjust the coordinates & pixels of image in forum,i.e.,
I think its java code !!

"x" is Latitude in fractional degrees
"y" is Longitude in fractional degrees
"deltaX" is positive / negative Latitude adjustment in PIXELS
"deltaY" is positive / negative Longitude adjustment in PIXELS
"z" is zoom level

function Adjust(x,y,deltaX,deltaY,z)
{
var offset=268435456;
var radius=offset/Math.PI;

function LToX(x)
{
return Math.round(offset+radius*x*Math.PI/180);
}

function LToY(y)
{
return Math.round(offset-radius*Math.log((1+Math.sin(y*Math.PI/180))/(1-Math.sin(y*Math.PI/180)))/2);
}

function XToL(x)
{
return ((Math.round(x)-offset)/radius)*180/Math.PI;
}

function YToL(y)
{
return (Math.PI/2-2*Math.atan(Math.exp((Math.round(y)-offset)/radius)))*180/Math.PI;
}

return {x:XToL(LToX(x)+(deltaX<<(21-z))),y:YToL(LToY(y)+(deltaY<<(21-z)))};
}

I'm not getting how to use dis function, if any 1 know about dis plz help me out.

With Regards !!
Vinod