function showNews(){
        document.getElementById('newsPanel').style.display = 'inline';
        document.getElementById('bookPanel').style.display = 'none';
        document.getElementById('articlePanel').style.display = 'none';
        document.getElementById('softwarePanel').style.display = 'none';
        
    }
       
    function showArticle(){
        document.getElementById('newsPanel').style.display = 'none';
        document.getElementById('bookPanel').style.display = 'none';
        document.getElementById('articlePanel').style.display = 'inline';
        document.getElementById('softwarePanel').style.display = 'none';
        
    }
    
    function showBook(){
        document.getElementById('newsPanel').style.display = 'none';
        document.getElementById('bookPanel').style.display = 'inline';
        document.getElementById('articlePanel').style.display = 'none';
        document.getElementById('softwarePanel').style.display = 'none';
        
    }
    
    function showSoftware(){
        document.getElementById('newsPanel').style.display = 'none';
        document.getElementById('bookPanel').style.display = 'none';
        document.getElementById('articlePanel').style.display = 'none';
        document.getElementById('softwarePanel').style.display = 'inline';
        
    }
    
    //-----------
    function showStatic1(){
        document.getElementById('static1').style.display = 'inline';
        document.getElementById('static2').style.display = 'none';
        document.getElementById('static3').style.display = 'none';
        
    }
    function showStatic2(){
        document.getElementById('static1').style.display = 'none';
        document.getElementById('static2').style.display = 'inline';
        document.getElementById('static3').style.display = 'none';
        
    }
    function showStatic3(){
        document.getElementById('static1').style.display = 'none';
        document.getElementById('static2').style.display = 'none';
        document.getElementById('static3').style.display = 'inline';
        
    }