function Scroll()
{
    document.getElementById('ScrollContent').style.marginTop= yPos + 'px';
    switch(yPos)
    {
        case 0:
            setTimeout("Scroll()",3000);
            break;
        case -50:
            setTimeout("Scroll()",3000);
            break;
        case -100:                                
            setTimeout("Scroll()",3000);        
            break;
        case -150:
            setTimeout("Scroll()",3000);        
            break;
        case -200:
            setTimeout("Scroll()",3000);        
            break;
        case -250:
            setTimeout("Scroll()",3000);        
            break;
        default:
            setTimeout("Scroll()",20);          
    }
    yPos-=1;
    if (yPos<-250)
    {
        yPos=50;
    }
}