/*  ------------------------------------------------------------------------------------------ */
/*  Fenster öffnen und schliessen  */
/*  ------------------------------------------------------------------------------------------ */
    var name = "";
    var fenster = null;
	var breite = 0;
	var hoehe = 0;
	

function oeffnen(datei,name,breite,hoehe) 
    {
    var xpos = (screen.width-breite)/2;
	var ypos = (screen.height-hoehe)/2;
    fenster=window.open( datei, + name,'locationbar=no,menubar=no,toolbar=no,status=no,scrollbars=yes,resizable=yes,width='+breite+',height='+hoehe+',screenY='+ypos+',screenX='+xpos+',top='+ypos+',left='+xpos);
    }
	

function zu() 
    {
        if(fenster == null) 	{  
			//alert("kein Fenster geöffnet");
           return ;
        }
        if(fenster.closed == true)  {  
			// alert("das Fenster wurde geschlossen");
            return (fenster = null);
        }
        else  { 
			//alert("ich habe mir ein fenster gemerkt, das schliesse ich!!");
          fenster.close();
          fenster=null;
        }
    }

	
/* ------------------------------------------------------------------------------------------ */
/*  sichtbar und unsichtbar  */
/*  ------------------------------------------------------------------------------------------ */
if(document.layers)var n4 = true;
if(document.all)var ie = true;
if(document.getElementById)var n6 = true;


function zeigekeins()
	{
    for(i=0;i<divs.length;i++)
        {
            if(n6 || ie)document.getElementById(divs[i]).style.visibility = "hidden";
            if(n4)document.layers[divs[i]].visibility = "hidden";
       }
    }
	
function zeigeeins(div1)
	{
    for(i=0;i<divs.length;i++)
        {
            if(n6 || ie)document.getElementById(divs[i]).style.visibility = "hidden";
            if(n4)document.layers[divs[i]].visibility = "hidden";
       }
    if(n6 || ie)
            {
                document.getElementById(div1).style.visibility = "visible";
            }
    if(n4)
           {
                document.layers[div1].visibility = "show"; 
           }
    }