function showArrows(){
        try {
			var prev = document.getElementById('prev');
	        prev.style.filter = "Alpha(opacity=40)";
	        prev.style.opacity = 0.4;
	        prev.style.MozOpacity = 0.4;        
	    } catch (err) {
	    }
        
        try {
			var start = document.getElementById('start');
	        start.style.filter = "Alpha(opacity=40)";
	        start.style.opacity = 0.4;
	        start.style.MozOpacity = 0.4;        
	    }catch (err) {
	    }
        
        try {
	        var next = document.getElementById('next');
	        next.style.filter = "Alpha(opacity=40)";
	        next.style.opacity = 0.4;
	        next.style.MozOpacity = 0.4;
	    } catch (err) {
	    }
    } 
    
    function mouseOnLink(i){
        
      	
      	if (i == 1) {
			var prev = document.getElementById('prev');
			prev.style.filter = "Alpha(opacity=80)";
        	prev.style.opacity = 0.8;
        	prev.style.MozOpacity = 0.8;      	
      	} else if(i == 2){
      		var start = document.getElementById('start');
      		start.style.filter = "Alpha(opacity=80)";
        	start.style.opacity = 0.8;
        	start.style.MozOpacity = 0.8;
      	} else {
			var next = document.getElementById('next');
      		next.style.filter = "Alpha(opacity=80)";
        	next.style.opacity = 0.8;
        	next.style.MozOpacity = 0.8;
      	}
        
    } 
    
    function hideArrows(){
        
      	try {
	        var prev = document.getElementById('prev');
	        prev.style.filter = "Alpha(opacity=30)";
	        prev.style.opacity = 0.3;
	        prev.style.MozOpacity = 0.3;
        }catch (err) {
	    }
        
        try {
	        var prev = document.getElementById('start');
	        start.style.filter = "Alpha(opacity=30)";
	        start.style.opacity = 0.3;
	        start.style.MozOpacity = 0.3;
        }catch (err) {
	    }
        
        try{
	        var next = document.getElementById('next');
	        next.style.filter = "Alpha(opacity=30)";
	        next.style.opacity = 0.3;
	        next.style.MozOpacity = 0.3;
        }catch (err) {
	    }
    } 
    
    
    
 function showLogin() {
	
	var login = document.getElementById('login');
	login.style.visibility = 'visible';
	     	
	var loginForm = document.getElementById('loginForm');
	loginForm.style.visibility = 'visible';       
	
	var loginAbbrechen = document.getElementById('loginAbbrechen');
	loginAbbrechen.style.visibility = 'visible';           
	    
}

function hideLogin() {

	var login = document.getElementById('login');
	login.style.visibility = 'hidden';
	     	
	var loginForm = document.getElementById('loginForm');
	loginForm.style.visibility = 'hidden';    
	
	var loginAbbrechen = document.getElementById('loginAbbrechen');
	loginAbbrechen.style.visibility = 'hidden';            

}