function ScrollText(content,btnPrevious,btnNext,autoStart)                                           
{                                                                                                  
    this.Speed =30;                                                                               
    this.Timeout = 3000;                                                                           
    this.LineHeight = 20;                                                                          
    this.NextButton = this.$(btnNext);                                                             
    this.PreviousButton = this.$(btnPrevious);                                                     
    this.ScrollContent = this.$(content);                                                          
    this.ScrollContent.innerHTML += this.ScrollContent.innerHTML;                                  
    this.NextButton.onclick = this.GetFunction(this,"Next");                                       
    this.PreviousButton.onclick = this.GetFunction(this,"Previous");                               
                                                                                                   
    this.NextButton.onmouseover = this.GetFunction(this,"Stop");                                   
    this.NextButton.onmouseout = this.GetFunction(this,"Start");                                   
                                                                                                   
    this.ScrollContent.onmouseover = this.GetFunction(this,"Stop");                                
    this.ScrollContent.onmouseout = this.GetFunction(this,"Start");                                
                                                                                                   
    this.PreviousButton.onmouseover = this.GetFunction(this,"Stop");                               
    this.PreviousButton.onmouseout = this.GetFunction(this,"Start");                               
    if(autoStart)                                                                                  
    {                                                                                              
        this.Start();                                                                              
    }                                                                                              
}                                                                                                  
                                                                                                   
ScrollText.prototype.$ = function(element)                                                         
{                                                                                                  
    return document.getElementById(element);                                                       
}                                                                                                  
                                                                                                   
ScrollText.prototype.Previous = function()                                                         
{                                                                                                  
    clearTimeout(this.AutoScrollTimer);                                                            
    clearTimeout(this.ScrollTimer);                                                                
    this.Scroll("up");                                                                             
}                                                                                                  
                                                                                                   
ScrollText.prototype.Next = function()                                                             
{                                                                                                  
    clearTimeout(this.AutoScrollTimer);                                                            
    clearTimeout(this.ScrollTimer);                                                                
    this.Scroll("down");                                                                           
}                                                                                                  
ScrollText.prototype.Start = function()                                                            
{                                                                                                  
    this.AutoScrollTimer = setTimeout(this.GetFunction(this,"AutoScroll"), this.Timeout);          
　　                                                                                               
}                                                                                                  
ScrollText.prototype.Stop = function()                                                             
{                                                                                                  
    clearTimeout(this.AutoScrollTimer);                                                            
}                                                                                                  
ScrollText.prototype.AutoScroll = function()                                                       
{                                                                                                  
    this.ScrollContent.scrollTop++;                                                                
    if(parseInt(this.ScrollContent.scrollTop) % this.LineHeight != 0)                              
    {                                                                                              
        this.ScrollTimer = setTimeout(this.GetFunction(this,"AutoScroll"), this.Speed);            
    }                                                                                              
    else                                                                                           
    {                                                                                              
        if(parseInt(this.ScrollContent.scrollTop) >= parseInt(this.ScrollContent.scrollHeight) / 2)
        {                                                                                          
            this.ScrollContent.scrollTop = 0;                                                      
        }                                                                                          
        this.AutoScrollTimer = setTimeout(this.GetFunction(this,"AutoScroll"), this.Timeout);      
    }                                                                                              
}                                                                                                  
ScrollText.prototype.Scroll = function(direction)                                                  
{                                                                                                  
    if(direction=="up")                                                                            
    {                                                                                              
        this.ScrollContent.scrollTop--;                                                            
    }                                                                                              
    else                                                                                           
    {                                                                                              
        this.ScrollContent.scrollTop++;                                                            
    }                                                                                              
    if(parseInt(this.ScrollContent.scrollTop) >= parseInt(this.ScrollContent.scrollHeight) / 2)    
        {                                                                                          
            this.ScrollContent.scrollTop = 0;                                                      
        }                                                                                          
    if(parseInt(this.ScrollContent.scrollTop) % this.LineHeight != 0)                              
    {                                                                                              
        this.ScrollTimer = setTimeout(this.GetFunction(this,"Scroll",direction), this.Speed);      
    }                                                                                              
}                                                                                                  
ScrollText.prototype.GetFunction = function(variable,method,param)                                 
{                                                                                                  
    return function()                                                                              
    {                                                                                              
        variable[method](param);                                                                   
    }                                                                                              
}