var isRunning = true;
        var header_count;
        var act_header = 0;
        var fadetime = 0.8;
        var blocktime = 800;
        var blockUserInteraction = false;
        


        
        function resetUserBlock() {
            blockUserInteraction = false;
        }
                
        Event.observe(window, 'load', function() {  
            
            header_count = $$('.wechslerbild').length;
            $('dot'+act_header).removeClassName('dot');
	        $('dot'+act_header).addClassName('selected');   
           

            function switchHeader() {    
                // Switch Wechsler
                if(isRunning && header_count > 0) {
                    $('wechsler'+act_header).fade({ duration: fadetime, from: 1, to: 0 });
	             	$('dot'+act_header).removeClassName('selected');
	                $('dot'+act_header).addClassName('dot');                      
                   
                    var next_header = act_header + 1;

                    if(next_header == header_count) {
                        act_header = 0;
                    } else {
                        act_header = next_header;
                    }
                    $('wechsler'+act_header).appear({ duration: fadetime, from: 0, to: 1 }); 
                //    $('navdots'+act_header).appear({ duration: fadetime, from: 0, to: 1 });
	             	$('dot'+act_header).removeClassName('dot');
	                $('dot'+act_header).addClassName('selected');                   
                }

                return false;
            }
            

                window.setInterval(switchHeader,4000);
              //  ajax.stop();
            
        });
        
        function showTab(number) {
            
            isRunning = false;
            
            if(blockUserInteraction != true && act_header!=number) {
        
                blockUserInteraction = true;
                // Hide tabs
                $('wechsler' + act_header).fade({duration: fadetime,    from: 1, to: 0});
               // $('navdots' + act_header).fade({duration: fadetime,from: 1,to: 0});
             	$('dot'+act_header).removeClassName('selected');
                $('dot'+act_header).addClassName('dot');               
                
                // Set new act_header        
                act_header = number;
                
                // Show Tabs
                $('wechsler'+act_header).appear({ duration: fadetime, from: 0, to: 1 }); 
             //   $('navdots'+act_header).appear({ duration: fadetime, from: 0, to: 1 });
             
             	$('dot'+act_header).removeClassName('dot');
                $('dot'+act_header).addClassName('selected');
                
                window.setTimeout(resetUserBlock,blocktime);    
            }        
        }
        
 /* Mouse over images*/       
function highlightMenuItem(caller) {
	_replaceImage(caller, 0);
}

function resetMenuItem(caller) {
	_replaceImage(caller, 1);
}

function _replaceImage(caller, which) {
	var imgElem = caller.firstChild;
	var newSrc = (which == 0) ? imgElem.src.replace(/_0/, "_1") : imgElem.src.replace(/_1/, "_0");
	imgElem.src = newSrc;
}