// ========  Bilder werden vorgeladen ======== //

bilder = new Array();

for (i = 1; i <= 10; i++) {
    bilder[i] = new Image();
    bilder[i].src = "img/nav"+i+"b.gif"; 
}

var b = 1;

for (i = 11; i <= 20; i++) {
    bilder[i] = new Image();
    bilder[i].src = "img/nav"+b+"c.gif"; 
    b++;
}

// ======== Initialisierung globaler Variablen ======== //

var yel = "yel";

// ======== Seite setzt Variable yel auf Anfangswert ======== //

function setYel(n)
 { 
  yel = n;
 }

// ======== Steuerung der Rollover-Effekte ======== //
    
function over(img,src)
  {
  	if (img != yel) {
  		document.images[img].src = src;
  	}
  }
  
 function out(img,src)
  { 
  	if (img != yel) {
  		document.images[img].src = src;
  	}
  }
  

// ========  Ein- und Ausblenden von Inhalten ======== //

function contOn(menu)
  {
   document.getElementById("menu"+menu+"").style.visibility= "hidden";
   document.getElementById("nav"+menu+"").style.backgroundColor= "#ededed";
   document.getElementById("nav1").style.backgroundColor= "#cbcbcb";
   document.getElementById("menu0").style.visibility= "visible";
   for(var i=1; i<11; i++) {
   if (document.getElementById("content"+i+"")) {
   		document.getElementById("content"+i+"").style.visibility= "visible";
   	}
   }
  }
  
function contOff()
  { 
   for(var i=1; i<11; i++) {
   if (document.getElementById("content"+i+"")) {
   		document.getElementById("content"+i+"").style.visibility= "hidden";
   	}
   }
}


// ========  Organisation von Menue und Navigation ======== //

function menu(nav,menu)
  { 
   for(var i=0; i<11; i++) {
   if (document.getElementById("nav"+i+"")) {
   		document.getElementById("nav"+i+"").style.backgroundColor= "#ededed";
   	}
   }
   document.getElementById(nav).style.backgroundColor = "#cbcbcb";
   for(var i=0; i<11; i++) {
   if (document.getElementById("menu"+i+"")) {
   		document.getElementById("menu"+i+"").style.visibility= "hidden";
   	}
   }
   document.getElementById(menu).style.visibility= "visible";
}

  
 
function click(img,src,n)
 {
  if (yel != "yel") {
  	i = yel.substr(2,3);
    document.images[yel].src = "img/nav"+i+"a.gif";
  }
  document.images[img].src = src;
   menu("nav"+n+"","menu"+n+"");
   contOff();
   yel = img;
 }
 
 // -----------  Seiten ohne Untermenues -------------- //
 
 function menuS(nav,menu)
  { 
   for(var i=0; i<11; i++) {
   if (document.getElementById("nav"+i+"")) {
   		document.getElementById("nav"+i+"").style.backgroundColor= "#ededed";
   	}
   }
   document.getElementById("nav1").style.backgroundColor = "#cbcbcb";
   for(var i=0; i<11; i++) {
   if (document.getElementById("menu"+i+"")) {
   		document.getElementById("menu"+i+"").style.visibility= "hidden";
   	}
   }
   document.getElementById("menu0").style.visibility= "visible";
}

 function clickS(img,src,n)
 {
  if (yel != "yel") {
  	i = yel.substr(2,3);
    document.images[yel].src = "img/nav"+i+"a.gif";
  }
  document.images[img].src = src;
   menuS("nav"+n+"","menu"+n+"");
   yel = img;
 }