// popup a window with a centered image
function popwin(imageUrl, bgColor, winWidth, winHeight, pageTitle) {
var posTop = Math.round(screen.height * .1);
var posLeft = Math.round(screen.width * .1);
var winSpecs = "toolbar=no,location=no,status=no,menubar=no,scrollbars=no,resizable=yes,top="+posTop+",left="+posLeft+",width="+winWidth+",height="+winHeight;
var code = "" + pageTitle + "";
code += "";
code += "![](" + imageUrl + ") |
";
newWindow = window.open("", "", winSpecs);
newWindow.document.open();
newWindow.document.write(code);
newWindow.document.close();
}