var modalbox;
      
    function ShowModalbox() {
    
    modalbox = document.getElementById("modalbox");
    //shade = document.getElementById("shade");
    
    //scrollWidth = document.body.scrollWidth;
    //scrollHeight = document.body.scrollHeight;
    
    //document.getElementById("main").style.filter = "alpha(opacity=80)";
    //document.getElementById("main").style.opacity = 0.8;
    //document.getElementById("main").style.display = "block";
    
    modalbox.style.display = "block";
    //shade.style.display = "block";
    
    posleft = 300;
    postop = 15;
    //posleft = Math.round(scrollWidth / 2) - 150;
    //postop = document.body.scrollHeight - 600;
    
    //shade.style.left = posleft + 7;
    //shade.style.top = document.body.scrollTop + 307;
    
    //modalbox.style.left = posleft;
    //modalbox.style.top = document.body.scrollTop + 300;
    
    }
    
    function HideModalbox() {
    
    //document.getElementById("main").style.display = "none";
    modalbox.style.display = "none";
    //shade.style.display = "none";
    
    }