var launchSlideShowX = (screen.width/2)-191;
var launchSlideShowY = (screen.height/2)-238;
var pos = "left="+launchSlideShowX+",top="+launchSlideShowY;
function launchSlideShow(){
launchSlideShowWindow = window.open("photogallery.html","PhotoGallery","width=380,height=380,"+pos);}