function toggle(id) {
 hideAll();
 show(id);
 }
 
 function hideAll()
 {
 arJobs = document.getElementsByClassName("titel");
 for(index = 0;index < arJobs.length;index++)
 {
     arJobs[index].style.display="none";
 }
 
 
 }

 function show(id) {

 this.document.getElementById(id).style.display = "block";
 }
 
 
    document.getElementsByClassName = function(cl) {
    var retnode = [];
    var myclass = new RegExp('\\b'+cl+'\\b');
    var elem = this.getElementsByTagName('*');
    for (var i = 0; i < elem.length; i++) {
    var classes = elem[i].className;
    if (myclass.test(classes)) retnode.push(elem[i]);
    }
    return retnode;
    };