function openImage(imgName, wt, ht, top, left) {
if (!top) top = (screen.height) ? ((screen.height - ht)/2 - 50) : 0;
if (!left) left = (screen.width) ? (screen.width - wt)/2 : 0;
image=window.open("","fullImage","width=" + (wt+20) + ",height=" + (ht+20) + ",top=" + top + ",left=" + left + ",toolbar=no,location=no,status=no,menubar=no,scrollbars=no,resizable=no");
image.focus();
image.document.open();
image.document.write("\n\n" + imgName + "\n");
image.document.write("\n");
image.document.write("![\"Close](\"")
\n");
image.document.write("\n");
image.document.close();
}