function openPictureWindow(imageName, imageWidth, imageHeight, altText, posLeft, posTop) {
if (imageWidth>800 || imageHeight>600) {
var bigImage = ", scrollbars, resizable";
} else {
var bigImage = "";
}
newWindow = window.open("", "newWindow", "width="+imageWidth+", height="+imageHeight+", left="+posLeft+", top="+posTop+bigImage);
newWindow.document.open();
newWindow.document.write(''+altText+'');
newWindow.document.write('![\"'+altText+'\"](\"'+imageName+'\")
');
newWindow.document.write('');
newWindow.document.close();
newWindow.focus();
}