// JavaScript Document

function clip (id) { 

if (document.getElementById("span_" + id).style.display == 'none') { 

document.getElementById("img_" + id).src = "minuszeichen.gif"; 

document.getElementById("span_" + id).style.display = "block"; } 

else { 

document.getElementById("img_" + id).src = "pluszeichen.gif"; 

document.getElementById("span_" + id).style.display = "none"; } }