var upH = 15;
var upW = 15;
var downH = 15;
var downW = 15;
var dragH = 34;
var dragW = 12;
var scrollH = scrollVy;
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;

picup = new Image();    picup.src = "up.gif";
picdown = new Image();  picdown.src = "down.gif";
picdrag = new Image();  picdrag.src = "drag.gif";

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 = document.all.content.offsetHeight;
                contentClipH = document.all.contentClip.offsetHeight;
        }
        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 = document.getElementById("content").offsetHeight;
                contentClipH = 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;
}


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 picDown(which){
        if(document.all) {
                eval('document.all.pic' + which + '.src = pic' + which + '.src');
        }
        else {
                eval('document.' + which + '.document.pic' + which + '.src = pic' + which + '.src');
        }
}

function picUp(which){
        if(document.all) {
                eval('document.all.pic' + which + '.src = "' + which + '.gif"');
        }
        else {
                eval('document.' + which + '.document.pic' + which + '.src = "' + which + '.gif"');
        }
}


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;
                mouseX = event.clientX;
        }
        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();
}