var sichtbar = 0;

function traders(){
if (sichtbar == 0){
var bezugsquellen = document.getElementById('bezugsquellen').style.display = 'block';
var close = document.getElementById('close').style.display = 'block';
var path = document.getElementById('find').src;
var newpath = path.substring(0,path.length -8) + 'Close.jpg';
document.getElementById('find').src = newpath;

}
if (sichtbar == 1){
var bezugsquellen = document.getElementById('bezugsquellen').style.display = 'none';
var close = document.getElementById('close').style.display = 'none';
var path = document.getElementById('find').src;
var newpath = path.substring(0,path.length -9) + 'Open.jpg';
document.getElementById('find').src = newpath;

}
sichtbar++;
if (sichtbar > 1){sichtbar = 0;}
}