a11 = new Image();
a11.src = "images/main.gif"
a12 = new Image();
a12.src = "images/main1.gif"

b11 = new Image();
b11.src = "images/zap.gif"
b12 = new Image();
b12.src = "images/zap1.gif"

c11 = new Image();
c11.src = "images/ser.gif"
c12 = new Image();
c12.src = "images/ser1.gif"

d11 = new Image();
d11.src = "images/dia.gif"
d12 = new Image();
d12.src = "images/dia1.gif"

e11 = new Image();
e11.src = "images/avt.gif"
e12 = new Image();
e12.src = "images/avt1.gif"

f11 = new Image();
f11.src = "images/cont.gif"
f12 = new Image();
f12.src = "images/cont1.gif"

g11 = new Image();
g11.src = "images/links.gif"
g12 = new Image();
g12.src = "images/links1.gif"

var fenster,closed=1;
function centerPopup(popup_name,popup_url,popup_with,popup_height,myWidth,myHeight)
{
if(fenster)
{ if(!closed)
  { fenster.close();
    closed=1;
    fenster=0;
  }
}
   if(!myWidth) {myWidth = 10;}
	if(!myHeight){myHeight = 50;}
	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=yes,scrollbars=auto,resizable=yes,width=" + popup_with + ",height=" + popup_height + ",left=" + popup_left + ",top=" + popup_top + ",screenX=" + popup_left + ",screenY=" + popup_top);
	fenster.focus();
}