XML Elves

hi,
in my application i need to zoom specific point when user clicked on that point.
that means if i clicked on some point i should show the more closer look of that area and data.
but here i want to center the clicked point on the viewing area.

here is my code.
pls send your comments and solutions
regards,
thanks.

-------------------------canvas.svg------------------------

<?xml version="1.0" encoding="iso-8859-1" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/SVG/DTD/svg10.dtd">
<svg viewBox="-2361 0 4625 2336" id="cont"
xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:space="preserve" onclick="get_url(evt)">
<defs>
<style type="text/css">
<![CDATA[
.str7 {stroke:#1F1A17;stroke-width:3}
.str4 {stroke:#0093DD;stroke-width:3}
.str5 {stroke:#0093DD;stroke-width:4}
.str3 {stroke:#0093DD;stroke-width:5}
.str2 {stroke:#0093DD;stroke-width:6}
.str1 {stroke:#0093DD;stroke-width:8}
.str6 {stroke:#BB90BB;stroke-width:14}
.str0 {stroke:#DA251D;stroke-width:21}
.fil0 {fill:none}
.fil2 {fill:#1F1A17}
.fil1 {fill:#C4E5FA}
.fil3 {fill:#FFFFFF}
.fnt1 {font-weight:normal;font-size:125;font-family:'Arial';text-renderingptimizeLegibility;}
.fnt0 {font-weight:normal;font-size:139;font-family:'Arial';text-decoration:underline;text-renderingptimizeLegibility;}
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</style>

<script><![CDATA[
var svgdoc = ""
var count=0;
function get_url(evt)
{
clickX=evt.clientX;
clickY=evt.clientY;
svgdoc = evt.target.ownerDocument
getURL("rivers"+count+".xml",callback)
zoom(clickX,clickY)
}
function callback(data)
{
if (data.success)
{
new_node = parseXML(data.content,svgdoc)
svgdoc.getElementById("base").appendChild(new_node )
count=count+1

}
}


//<g onclick="document.getElementById('cont').setAttrib ute('viewBox','-766 860 1190 1020');" id="sbg"><rect style="fill:#ffffff;fill-opacity:0;stroke:white;stroke-width:13" x="-2361" y="0" width="4625" height="2336"/></g>
function zoom(xm,ym){
//node = evt.target.ownerDocument.getElementById("cont")
//
node= svgdoc.getElementById("cont")
node.setAttribute('viewBox',(xm-75)+' '+(ym-75)+' 150 150')
//node.setAttribute('viewBox','100 860 750 750')

}
]]></script>

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------------------------------------------------------------------------

I think that your problem come from coordinates.
As you use viewBox, clientX and clientY give coordinates in window and not in main svg.
You have to compute to find svg coordinates.

In ASV6 or Batik you can use getScreenCTM to get matrix for transformation from svg to window.

In ASV3 you have to use dimensions of your window and it's only possible in IE ...

If there is your problem, see
http://pilat.free.fr/english/routines/coordo.htm

Michel