function InhaltSchreiben(nr){
var f = document.getElementById("if");
   switch (nr) {
    case 1: f.contentWindow.location = "2012.php"; break;
    case 2: f.contentWindow.location = "2011.php"; break;
    case 3: f.contentWindow.location = "2010.php"; break;
    case 4: f.contentWindow.location = "2009.php"; break;
    case 5: f.contentWindow.location = "akte.php"; break;
    case 6: f.contentWindow.location = "kontakt.htm"; break;
  } 
}



var butt1 = new Array;
var butt2 = new Array;
var butt3 = new Array;
var butt4 = new Array;
var butt5 = new Array;
var butt6 = new Array;

butt1[0] = new Image(); butt1[0].src = "Buttons/2012U.jpg";
butt1[1] = new Image(); butt1[1].src = "Buttons/2012UO.jpg";
butt1[2] = new Image(); butt1[2].src = "Buttons/2012D.jpg";
butt1[3] = new Image(); butt1[3].src = "Buttons/2012DO.jpg";

butt2[0] = new Image(); butt2[0].src = "Buttons/2011U.jpg";
butt2[1] = new Image(); butt2[1].src = "Buttons/2011UO.jpg";
butt2[2] = new Image(); butt2[2].src = "Buttons/2011D.jpg";
butt2[3] = new Image(); butt2[3].src = "Buttons/2011DO.jpg";

butt3[0] = new Image(); butt3[0].src = "Buttons/2010U.jpg";
butt3[1] = new Image(); butt3[1].src = "Buttons/2010UO.jpg";
butt3[2] = new Image(); butt3[2].src = "Buttons/2010D.jpg";
butt3[3] = new Image(); butt3[3].src = "Buttons/2010DO.jpg";

butt4[0] = new Image(); butt4[0].src = "Buttons/2009U.jpg";
butt4[1] = new Image(); butt4[1].src = "Buttons/2009UO.jpg";
butt4[2] = new Image(); butt4[2].src = "Buttons/2009D.jpg";
butt4[3] = new Image(); butt4[3].src = "Buttons/2009DO.jpg";

butt5[0] = new Image(); butt5[0].src = "Buttons/AkteU.jpg";
butt5[1] = new Image(); butt5[1].src = "Buttons/AkteUO.jpg";
butt5[2] = new Image(); butt5[2].src = "Buttons/AkteD.jpg";
butt5[3] = new Image(); butt5[3].src = "Buttons/AkteDO.jpg";

butt6[0] = new Image(); butt6[0].src = "Buttons/KontaktU.jpg";
butt6[1] = new Image(); butt6[1].src = "Buttons/KontaktUO.jpg";
butt6[2] = new Image(); butt6[2].src = "Buttons/KontaktD.jpg";
butt6[3] = new Image(); butt6[3].src = "Buttons/KontaktDO.jpg";

var buttD=1;

function Bildtausch(bildnr,status){
var statusNr;
   
   if (status == "click")  
      { 
	  if (buttD==1){document.images[0].src = butt1[0].src;}
      if (buttD==2){document.images[1].src = butt2[0].src;}
      if (buttD==3){document.images[2].src = butt3[0].src;}
      if (buttD==4){document.images[3].src = butt4[0].src;}
      if (buttD==5){document.images[4].src = butt5[0].src;}
      if (buttD==6){document.images[5].src = butt5[0].src;}

	  statusNr = 2;
      InhaltSchreiben(bildnr);
	  buttD = bildnr;
	  }
   if (status == "over") 
      { 
	  statusNr = 1;
	  if (buttD == bildnr) { statusNr = 3;}
      }
  
   if (status == "out")  
      { 
	  statusNr = 0;
	  if (buttD == bildnr) { statusNr = 2;}
      }
	  
   
   if (bildnr==1){document.images[0].src = butt1[statusNr].src;}
   if (bildnr==2){document.images[1].src = butt2[statusNr].src;}
   if (bildnr==3){document.images[2].src = butt3[statusNr].src;}
   if (bildnr==4){document.images[3].src = butt4[statusNr].src;}
   if (bildnr==5){document.images[4].src = butt5[statusNr].src;}
   if (bildnr==6){document.images[5].src = butt6[statusNr].src;}

}