// Open new pop-up window with url, width and height
function openWindow(url,width,height) {
var left = (window.screen.width - width) / 2;
var top = (window.screen.height - height) / 2;
var parameters = 'left=' + left + ',top=' + top + ',width=' + width + ',height=' + height + ',toolbar=0,menubar=0,location=0,status=0,scrollbars=0,resizable=0';
window.open(url,'login',parameters);
}