How are DX and DY coordinates calculated in flash?

I'm trying to update a clients site and the original developer left almost no instructions. The code is all updated through XML.

Here is a sample of the code

enter code here<FOLDER NAME="COMMERCIAL">
    <GALLERY NAME="LOCANDA VERDE: New York">
            <IMG HEIGHT="500" CAPTION="Some photo" WIDTH="393" SRC="locanda1.jpg" DX="60" DY="40" LINKTEXT="" LINKURL="" INFOTEXT="SOHO, NEW YORK"/>
            <IMG HEIGHT="300" CAPTION="Some photo" WIDTH="450" SRC="locanda2.jpg" DX="160" DY="80" LINKTEXT="" LINKURL="" INFOTEXT="SOHO, NEW YORK"/>
            <IMG HEIGHT="500" CAPTION="Some photo" WIDTH="393" SRC="locanda3.jpg" DX="80" DY="260" LINKTEXT="" LINKURL="" INFOTEXT="SOHO, NEW YORK"/>
            <IMG HEIGHT="500" CAPTION="Some photo" WIDTH="393" SRC="locanda4.jpg" DX="120" DY="60" LINKTEXT="" LINKURL="" INFOTEXT="SOHO, NEW YORK"/>
            <IMG HEIGHT="393" CAPTION="Some photo" WIDTH="500" SRC="locanda5.jpg" DX="180" DY="100" LINKTEXT="" LINKURL="" INFOTEXT="SOHO, NEW YORK"/>
            <IMG HEIGHT="500" CAPTION="Some photo" WIDTH="433" SRC="locanda6.jpg" DX="60" DY="140" LINKTEXT="" LINKURL="" INFOTEXT="SOHO, NEW YORK"/>
            <IMG HEIGHT="500" CAPTION="Some photo" WIDTH="393" SRC="locanda7.jpg" DX="100" DY="200" LINKTEXT="" LINKURL="" INFOTEXT="SOHO, NEW YORK"/>
        </GALLERY>`enter code here

It relates to this page: http://meyerdavis.com/ Click Commercial > Click Laconda Verde New York. The xml file pulls a jpg from 2 places, one is a thumb nail that are all 60 x 60 and then one is the bigger sized image. The issue that I'm having is that I can't figure out how the DX and DY coordinates are generated for each item. Any help would be much appreciated.

`

Edit: Here's the code from the comment below.

platformblock.expandspeed = 0.02; 
platformblock.h = 450 - platformblock.dy1; 
//platformblock.h = 402; 
platformblock.dy2 = 0; 
platformblock.onResize(); 
/**/ 
platformblock.onEnterFrame = function() { 
    th开发者_开发技巧is.dy1 += (48 - this.dy1)*this.expandspeed; 
    this.h = 450 - this.dy1; 
    if(this.expandspeed<0.3) { 
        this.expandspeed += 0.02; 
    } 
    if(Math.abs(this.dy1-48)<0.2) { 
        this.dy1 = 48; 
    } 
    if(this.platform._height==402 && this.dy1==48){ 
        this.h = null; 
        this.onResize(); 
        this.onEnterFrame = null; 
    } 
} 
platformblock._resizeto(800, 402, _root.play, _root, 0.08); 
titleblockcontainer.play(); 
/**/ 
stop();

Just looking at the page, I would guess DX and DY refer to the position (from the top left) the thumbnail moves to when you click it, just before the large image is shown. Try changing some of the values - can you see anything move or appear differently?