function DisplayRightPage(sender)
{
    var Page1 = document.getElementById("rightcontent1");
    var Page2 = document.getElementById("rightcontent2");;
    var Page3 = document.getElementById("rightcontent3");;
    
    switch (sender)
    {
        case 1:
            Page1.style.display = '';
            Page2.style.display = 'none';
            Page3.style.display = 'none';
            break;
        case 2:
            Page2.style.display = '';
            Page1.style.display = 'none';            
            Page3.style.display = 'none';
            break;
        case 3:
            Page3.style.display = '';
            Page1.style.display = 'none';
            Page2.style.display = 'none';                        
            break;
    }
    
    return false;   
}