//==========================
function open_window(href, width, height, features, window_name) {
	var iMyWidth;
	var iMyHeight;

	if(!window_name) {window_name = "";}
	if(!width) {width = 400;}
	if(!height){height = 400;}
	if(!features){features = "toolbar=no,location=no,status=no,menubar=yes,scrollbars=yes,resizable=yes";}

	iMyWidth = (window.screen.width-(width))/2; 
	iMyHeight = (window.screen.height-(height))/2;

	var win2 = open(""+href+"", window_name, "height=" + height + ",width=" + width + ",left=" + iMyWidth + ",top=" +
		iMyHeight + ",screenX=" + iMyWidth + ",screenY=" + iMyHeight + "," + features+ "");

	if (win2 != null)	{ win2.focus(); }
}
function centerPopup(popup_name,popup_url,popup_with,popup_height,myWidth,myHeight) {
	if(!myWidth) {myWidth = 10;}
	if(!myHeight){myHeight = 40;}

	var popup_left = (window.screen.width/2)  - (popup_with/2 + myWidth);
	var popup_top  = (window.screen.height/2) - (popup_height/2 + myHeight);
	var fenster = window.open(popup_url ,popup_name,
		"toolbar=no,location=no,status=no,menubar=no,scrollbars=yes,resizable=no,width=" + 
		popup_with + ",height=" + popup_height + ",left=" + popup_left + ",top=" + popup_top +
		",screenX=" + popup_left + ",screenY=" + popup_top);
	
	fenster.focus();
}