function show(id)
{
  document.getElementById(id).style.visibility='visible';
}

function hide(id)
{
  document.getElementById(id).style.visibility='hidden';
};

function cont(url,name) {
	var cont = open(url,name,"toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=1,width=770,height=340,left=50,top=370");
	if (cont.opener == null)
    	cont.opener = window;
	cont.opener.window.top.name="mainwindow";
  	cont.focus();
}
function karte(url,name) {

  var karte = open(url,name,"toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=1,width=645,height=540,left=80,top=25");

  if (karte.opener == null)

    karte.opener = window;

	karte.opener.window.top.name="hauptfenster";

  karte.focus();  

}