function impressum()
{
var iMyWidth;
var iMyHeight;
iMyWidth = (window.screen.width/2) - (360 + 8)
iMyHeight = (window.screen.height/2) - (216 + 28)
var win2 = window.open("impressum.htm","Impressum","status=yes,resizable=yes,width=720,height=432,left=" + iMyWidth + ",top=" + iMyHeight + ",screenX=" + iMyWidth + ",screenY=" + iMyHeight + ",scrollbars=yes,menubar=no");
}