function openPictureWindow(imageName,imageWidth,imageHeight,alt) {
var myWidth = imageWidth;
var myHeight = imageHeight;
if (screen.width < imageWidth) {
var myWidth = (screen.width-100);
var myLeft = 80;
}
if (screen.height < imageHeight) {
var myHeight = (screen.height-100);
var myTop = 50;
}
if (screen.width < (imageWidth) || screen.height < (imageHeight)){
newWindow = window.open("","newWindow","width="+myWidth+",height="+myHeight+",scrollbars=yes,resizable=yes,left="+myLeft+",top="+myTop)
}else{
var myLeft = (screen.width-imageWidth)/2;
var myTop = (screen.height-imageHeight)/2;
newWindow = window.open("","newWindow","width="+imageWidth+",height="+imageHeight+",scrollbars=no,left="+myLeft+",top="+myTop)
}
newWindow.document.open();
newWindow.document.write(''+alt+'');
newWindow.document.write('![\"'+alt+'\"](\"'+imageName+'\")
');
newWindow.document.write('');
newWindow.document.close();
newWindow.focus();
}