function openWindow(theURL,winName,winWidth,winHeight,otherFeatures)
{
    var x = 0;
    var y = 0;
    x = (screen.availWidth - 12 - winWidth) / 2;
    y = (screen.availHeight - 48 - winHeight) / 2;
    if (otherFeatures != "") {otherFeatures = "," + otherFeatures}
    var features = "screenX=" + x + ",screenY=" + y + ",width=" + winWidth + 
        ",height=" + winHeight+",top="+y+",left="+x+"'" + otherFeatures;
    newwindow = window.open(theURL,winName,features);
	if (window.focus) {newwindow.focus()}
	if (window.confirm) 
	{
	    //alert('ok');
	}
	return newwindow;
    
}

function test()
{
alert('test');
}

function showFoto(bestand)
{
    openWindow(bestand, 'bartels_foto', '1000px', '800px','');
}