function MoveUp(divContent){
    var conT = document.getElementById(divContent).offsetTop;
    var conH = document.getElementById(divContent).offsetHeight;
    var conS = conT;
    
    if(conS < 0){
        document.getElementById(divContent).style.top = conT + 100 + 'px';
    }
}

function MoveDown(divContent){
    var conT = document.getElementById(divContent).offsetTop;
    var conH = document.getElementById(divContent).offsetHeight;
    var conS = conT + conH - 200;
    
    if (window.opera || navigator.userAgent.indexOf("Netscape")!=-1){
        document.getElementById(divContent).style.top = conT - 100 + 'px';
    }else{
        if(conS > 0){
            document.getElementById(divContent).style.top = conT - 100 + 'px';
        }
    }
}