var impressum = 0;
var istschon = 0;
var iMyWidth;
var iMyHeight;


function unternehmenWin(jm) {
if (istschon == 0){
	iMyWidth = (window.screen.width/2) - (320 + 10); //half the screen width minus half the new window width (plus 5 pixel borders).
	iMyHeight = (window.screen.height/2) - (250 + 50); //half the screen height minus half the new window height (plus title and status bars).
impressum= window.open( jm + '.html','vwbn2','resizable=0,scrollbars=yes,width=650,height=470,left=' + iMyWidth + ',top=' + iMyHeight + ',screenX=' + iMyWidth + ',screenY=' + iMyHeight);
istschon = 1}
else
{nachvorne(jm);}
}

/**
 * copied and adapted by diefans and by ilja
 */

function unternehmenWinDyn(jm) {
	if (typeof loc == 'undefined') loc = 'seiten';
	if (istschon == 0){
		iMyWidth = (window.screen.width/2) - (320 + 10); //half the screen width minus half the new window width (plus 5 pixel borders).
		iMyHeight = (window.screen.height/2) - (250 + 50); //half the screen height minus half the new window height (plus title and status bars).
		impressum= window.open( 'fenster.php?id=' + jm,'vwbn2','resizable=0,scrollbars=yes,width=650,height=470,left=' + iMyWidth + ',top=' + iMyHeight + ',screenX=' + iMyWidth + ',screenY=' + iMyHeight);
		istschon = 1
	} else {
		if (impressum.closed){
			impressum= window.open( 'fenster.php?id=' + jm,'vwbn2','resizable=0,scrollbars=yes,width=650,height=470,left=' + iMyWidth + ',top=' + iMyHeight + ',screenX=' + iMyWidth + ',screenY=' + iMyHeight);
		} else {
			impressum= window.open( 'fenster.php?id=' + jm,'vwbn2','resizable=0,scrollbars=yes,width=650,height=470,left=' + iMyWidth + ',top=' + iMyHeight + ',screenX=' + iMyWidth + ',screenY=' + iMyHeight);
			impressum.focus();
		}
	}
}

function nachvorne(jm) {
if (impressum.closed){
impressum= window.open( jm + '.html','vwbn2','resizable=0,scrollbars=yes,width=650,height=470,left=' + iMyWidth + ',top=' + iMyHeight + ',screenX=' + iMyWidth + ',screenY=' + iMyHeight);
}
else
{
impressum= window.open( jm + '.html','vwbn2','resizable=0,scrollbars=yes,width=650,height=470,left=' + iMyWidth + ',top=' + iMyHeight + ',screenX=' + iMyWidth + ',screenY=' + iMyHeight);
impressum.focus();
}}