function setBoxes(n){
	var mytag = document.getElementsByTagName("a");
	var nboxes = new Array();	
	// auslesen, id in array schreiben
	for(i=0; i < mytag.length; i++){
	   if(mytag[i].id != ""){
	   		v = (mytag[i].id).split("_");
	   		if(v[0] == "nbh"){
	   				nboxes[nboxes.length] = v[1];
	   		}
	   }
	}	
	for(k=0; k < nboxes.length; k++){
	   // nbh_	= Header // nbc_= Content	// nbf_	= Footer   
	   mynr = nboxes[k];
	   nbh = document.getElementById( "nbh_" + mynr );
	   nbc = document.getElementById( "nbc_" + mynr );
	   nbf = document.getElementById( "nbf_" + mynr );
	   if(mynr == n){
	   		nbc.style.display = 'block';
	   		nbf.style.display = 'block';
	   }
	 	 else{
	   		nbc.style.display = 'none';
	   		nbf.style.display = 'none';
	   }	   
	   var footerklasse = "nbf_p_follows";
	   // footer: className
	   if(nboxes[k+1] == n){
	   		footerklasse = "nbf_a_follows";
	   }
	   if(k == nboxes.length - 1){
	   		if(mynr == n){
	   				footerklasse = "nbf_a_last";
	   		}
	   		else {
	   				footerklasse = "nbf_p_last";
	   		}
	   }  
	   var headerklasse = "nbh_p_before";
	   // header: className
	   
	   if(mynr == n && k == 0){
	   			headerklasse = "nbh_first";
	   }		
	   if(mynr == n && k > 0){
	   			headerklasse = "nbh_a_norm";
	   }
	   if(mynr != n && k == 0){
	   			headerklasse = "nbh_p_first";
	   }
	   if(mynr != n && mynr > n && k < nboxes.length - 1){
	   			headerklasse = "nbh_inner";
	   }	   	   			   			   			
	   if(mynr != n && k == nboxes.length - 1){
	   			headerklasse = "nbh_last";
	   }
	   nbh.className = headerklasse;
	   nbf.className = footerklasse;
	}
}

function showbox(ort)
	{	
document.getElementById("hamburg").style.visibility = "hidden"
document.getElementById("berlin").style.visibility = "hidden"
document.getElementById("leipzig").style.visibility = "hidden"
document.getElementById("düsseldorf").style.visibility = "hidden"
document.getElementById("frankfurt").style.visibility = "hidden"
document.getElementById("stuttgart").style.visibility = "hidden"	
document.getElementById("münchen").style.visibility = "hidden"	

		if ( document.getElementById(ort).style.visibility == "hidden" )
        {

	   		document.getElementById(ort).style.visibility="visible";
	    }
		else
		{
		document.getElementById(ort).style.visibility="hidden";
		}

}