How to specify the x, y coordinates in imagecreate()

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Hello...

 

I need to create two image base to display two independent bar charts in a single page.

One I could,  how to create another in same page like.....

 

$img_width=800;

$img_height=200;

$img=imagecreatetruecolor($img_width,$img_height);

 

this image is created on top left of the screen..

using $img i created a bar like, using  imagefilledrectangle() on it

now I need to create another image beneath the first one.

 

Help Me!