function showimg(istring)
{
pwin = open("","i4html","toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,width=300,height=400");
pwin.moveTo((screen.availWidth-300)/2,(screen.availHeight-400)/2);
pwin.focus();
pwin.document.open("text/html")
pwin.document.write('Image');
pwin.document.write('
');
pwin.document.writeln('');
pwin.document.write("");
pwin.document.close()
return;
}