<!-- pop-up window with SVG Viewer Tips
var svgpopup
//
// === Open window and display data
//
function opensvgpopup()
{
  svgpopup = window.open("svgviewertips.shtml","SvgPopUp","width=480,height=320,left=5,top=5,screenx=5,screeny=5,resizable")
  svgpopup.focus()
}
//
// === Close window
//
function closesvgpopup()
{
  if (!svgpopup.closed)
  {
    svgpopup.close()
  }
}
//-->