var upH = 13; 
var upW = 13; 
var downH = 13; 
var downW = 13; 
var dragH = 13; 
var dragW = 13; 
var scrollH = 182; 
var speed = 4; 
var dom = document.getElementById ? true:false;
var nn4 = document.layers ? true:false;
var ie4 = document.all ? true:false;
var mouseY; 
var mouseX; 
var clickUp = false; 
var clickDown = false; 
var clickDrag = false; 
var clickAbove = false; 
var clickBelow = false; 
var timer = setTimeout("",500); 
var upL; 
var upT; 
var downL; 
var downT; 
var dragL; 
var dragT; 
var rulerL; 
var rulerT; 
var contentT; 
var contentH; 
var contentClipH; 
var scrollLength; 
var startY; 

function down(e){
        if((document.layers && e.which!=1) || (document.all && event.button!=1)) return true; 
        getMouse(e);
        startY = (mouseY - dragT);
        
       
        if(mouseX >= upL && (mouseX <= (upL + upW)) && mouseY >= upT && (mouseY <= (upT + upH))){
                clickUp = true;
                return scrollUp();
        }       
       
        else if(mouseX >= downL && (mouseX <= (downL + downW)) && mouseY >= downT && (mouseY <= (downT + downH))){
                clickDown = true;
                return scrollDown();
        }
       
        else if(mouseX >= dragL && (mouseX <= (dragL + dragW)) && mouseY >= dragT && (mouseY <= (dragT + dragH))){
                clickDrag = true;
                return false;
        }
        else if(mouseX >= dragL && (mouseX <= (dragL + dragW)) && mouseY >= rulerT && (mouseY <= (rulerT + scrollH))){
               
                if(mouseY < dragT){
                        clickAbove = true;
                        clickUp = true;
                        return scrollUp();
                }
               
                else{
                        clickBelow = true;
                        clickDown = true;
                        return scrollDown();
                }
        }
      
        else{
                return true;
        }
}

function move(e){
        if(clickDrag && contentH > contentClipH){
                getMouse(e);
                dragT = (mouseY - startY);
                
                if(dragT < (rulerT))
                        dragT = rulerT;         
                if(dragT > (rulerT + scrollH - dragH))
                        dragT = (rulerT + scrollH - dragH);
                
                contentT = ((dragT - rulerT)*(1/scrollLength));
                contentT = eval('-' + contentT);

                moveTo();
                
             
                if(ie4)
                        return false;
        }
}

function up(){
        clearTimeout(timer);
     
        clickUp = false;
        clickDown = false;
        clickDrag = false;
        clickAbove = false;
        clickBelow = false;
        return true;
}

function getT(){
        if(ie4)
                contentT = document.all.content.style.pixelTop;
        else if(nn4)
                contentT = document.contentClip.document.content.top;
        else if(dom)
                contentT = parseInt(document.getElementById("content").style.top);
}

function getMouse(e){
        if(ie4){
                mouseY = event.clientY + document.body.scrollTop;
                mouseX = event.clientX + document.body.scrollLeft;
        }
        else if(nn4 || dom){
                mouseY = e.pageY;
                mouseX = e.pageX;
        }
}

function moveTo(){
        if(ie4){
                document.all.content.style.top = contentT;
                document.all.ruler.style.top = dragT;
                document.all.drag.style.top = dragT;
        }
        else if(nn4){
                document.contentClip.document.content.top = contentT;
                document.ruler.top = dragT;
                document.drag.top = dragT;
        }
        else if(dom){
                document.getElementById("content").style.top = contentT + "px";
                document.getElementById("drag").style.top = dragT + "px";
                document.getElementById("ruler").style.top = dragT + "px";
        }
}

function scrollUp(){
        getT();
        
        if(clickAbove){
                if(dragT <= (mouseY-(dragH/2)))
                        return up();
        }
        
        if(clickUp){
                if(contentT < 0){               
                        dragT = dragT - (speed*scrollLength);
                        
                        if(dragT < (rulerT))
                                dragT = rulerT;
                                
                        contentT = contentT + speed;
                        if(contentT > 0)
                                contentT = 0;
                        
                        moveTo();
                        timer = setTimeout("scrollUp()",25);
                }
        }
        return false;
}

function scrollDown(){
        getT();
        
        if(clickBelow){
                if(dragT >= (mouseY-(dragH/2)))
                        return up();
        }

        if(clickDown){
                if(contentT > -(contentH - contentClipH)){                      
                        dragT = dragT + (speed*scrollLength);
                        if(dragT > (rulerT + scrollH - dragH))
                                dragT = (rulerT + scrollH - dragH);
                        
                        contentT = contentT - speed;
                        if(contentT < -(contentH - contentClipH))
                                contentT = -(contentH - contentClipH);
                        
                        moveTo();
                        timer = setTimeout("scrollDown()",25);
                }
        }
        return false;
}

function reloadPage(){
        location.reload();
}

function eventLoader(){
        if(ie4){
                
                upL = document.all.up.style.pixelLeft;
                upT = document.all.up.style.pixelTop;           
                
                downL = document.all.down.style.pixelLeft;
                downT = document.all.down.style.pixelTop;
                
                dragL = document.all.drag.style.pixelLeft;
                dragT = document.all.drag.style.pixelTop;               
               
                rulerT = document.all.ruler.style.pixelTop;             
                
                contentH = parseInt(document.all.content.scrollHeight);
                contentClipH = parseInt(document.all.contentClip.style.height);
        }
        else if(nn4){
               
                upL = document.up.left;
                upT = document.up.top;          
               
                downL = document.down.left;
                downT = document.down.top;              
               
                dragL = document.drag.left;
                dragT = document.drag.top;              
               
                rulerT = document.ruler.top;
              
                contentH = document.contentClip.document.content.clip.bottom;
                contentClipH = document.contentClip.clip.bottom;
        }
        else if(dom){
              
                upL = parseInt(document.getElementById("up").style.left);
                upT = parseInt(document.getElementById("up").style.top);
              
                downL = parseInt(document.getElementById("down").style.left);
                downT = parseInt(document.getElementById("down").style.top);
              
                dragL = parseInt(document.getElementById("drag").style.left);
                dragT = parseInt(document.getElementById("drag").style.top);
              
                rulerT = parseInt(document.getElementById("ruler").style.top);
             
                contentH = parseInt(document.getElementById("content").offsetHeight);
                contentClipH = parseInt(document.getElementById("contentClip").offsetHeight);
                document.getElementById("content").style.top = 0 + "px";
                
        }
       
        scrollLength = ((scrollH-dragH)/(contentH-contentClipH));
      
        if(nn4){
                document.captureEvents(Event.MOUSEDOWN | Event.MOUSEMOVE | Event.MOUSEUP);
                window.onresize = reloadPage;
        }
        document.onmousedown = down;
        document.onmousemove = move;
        document.onmouseup = up;
}