function foto(URL) {
var xMax = screen.width, yMax = screen.height;
var xMax = window.outerWidth, yMax = window.outerHeight;
var xMax = 800, yMax=600;
var xOffset = (xMax - 200)/0, yOffset = (yMax - 200)/0;
window.open(URL, 'ema3', 'width=625,height=495,screenX='+xOffset+',screenY='+yOffset+',top='+yOffset+',left='+xOffset+'');
}
function fotom(URL) {
var xMax = screen.width, yMax = screen.height;
var xMax = window.outerWidth, yMax = window.outerHeight;
var xMax = 800, yMax=600;
var xOffset = (xMax - 200)/0, yOffset = (yMax - 200)/0;
window.open(URL, 'ema3', 'width=625,height=469,screenX='+xOffset+',screenY='+yOffset+',top='+yOffset+',left='+xOffset+'');
}