function dw_scrollObj(wndoId, lyrId, horizId) {
    if (!document.getElementById) return;
    var wn = document.getElementById(wndoId);
    this.id = wndoId; dw_scrollObj.col[this.id] = this;
    this.animString = "dw_scrollObj.col." + this.id;
    this.load(lyrId, horizId);
    
    if (wn.addEventListener) {
        wn.addEventListener('DOMMouseScroll', dw_scrollObj.doOnMouseWheel, false);
    } 
    wn.onmousewheel = dw_scrollObj.doOnMouseWheel;
}

dw_scrollObj.col = {};
dw_scrollObj.defaultSpeed = dw_scrollObj.prototype.speed = 100;
dw_scrollObj.defaultSlideDur = dw_scrollObj.prototype.slideDur = 500;

dw_scrollObj.prototype.on_load = function() {}
dw_scrollObj.prototype.on_scroll = function() {}
dw_scrollObj.prototype.on_scroll_start = function() {}
dw_scrollObj.prototype.on_scroll_stop = function() {}
dw_scrollObj.prototype.on_scroll_end = function() {} 

dw_scrollObj.prototype.load = function(lyrId, horizId) {
    var wndo, lyr;
    if (this.lyrId) { 
        lyr = document.getElementById(this.lyrId);
        lyr.style.visibility = "hidden";
    }
    this.lyr = lyr = document.getElementById(lyrId); 
    this.lyr.style.position = 'absolute'; 
    this.lyrId = lyrId;
    this.horizId = horizId || null; 
    wndo = document.getElementById(this.id);
    this.y = 0; this.x = 0; this.shiftTo(0,0);
    this.maxY = (lyr.offsetHeight - wndo.offsetHeight > 0)? lyr.offsetHeight - wndo.offsetHeight: 0;
    this.wd = horizId? document.getElementById(horizId).offsetWidth: lyr.offsetWidth;
    this.maxX = (this.wd - wndo.offsetWidth > 0)? this.wd - wndo.offsetWidth: 0;
    lyr.style.visibility = "visible";   
    this.ready = true; this.on_load(); 
}

dw_scrollObj.prototype.shiftTo = function(x, y) {
    if (this.lyr) {
        this.lyr.style.left = (this.x = x) + "px"; 
        this.lyr.style.top = (this.y = y) + "px";
    }
}

dw_scrollObj.prototype.getX = function() { return this.x; }
dw_scrollObj.prototype.getY = function() { return this.y; }

dw_scrollObj.prototype.updateDims = function() {
    var wndo = document.getElementById(this.id);
    var lyr = document.getElementById( this.lyrId );
    this.maxY = (lyr.offsetHeight - wndo.offsetHeight > 0)? lyr.offsetHeight - wndo.offsetHeight: 0;
    this.wd = this.horizId? document.getElementById( this.horizId ).offsetWidth: lyr.offsetWidth;
    this.maxX = (this.wd - wndo.offsetWidth > 0)? this.wd - wndo.offsetWidth: 0;
}

dw_scrollObj.prototype.initScrollVals = function(deg, speed) {
    if (!this.ready) return; 
    if (this.timerId) {
        clearInterval(this.timerId); this.timerId = 0;
    }
    this.speed = speed || dw_scrollObj.defaultSpeed;
    this.fx = (deg == 0)? -1: (deg == 180)? 1: 0;
    this.fy = (deg == 90)? 1: (deg == 270)? -1: 0;
    this.endX = (deg == 90 || deg == 270)? this.x: (deg == 0)? -this.maxX: 0; 
    this.endY = (deg == 0 || deg == 180)? this.y: (deg == 90)? 0: -this.maxY;
    this.lyr = document.getElementById(this.lyrId);
    this.lastTime = new Date().getTime();
    this.on_scroll_start(this.x, this.y);  
    this.timerId = setInterval(this.animString + ".scroll()", 10);    
}

dw_scrollObj.prototype.scroll = function() {
    var now = new Date().getTime();
    var d = (now - this.lastTime)/1000 * this.speed;
    if (d > 0) { 
        var x = this.x + Math.round(this.fx * d); var y = this.y + Math.round(this.fy * d);
        if ( ( this.fx == -1 && x > -this.maxX ) || ( this.fx == 1 && x < 0 ) || 
                ( this.fy == -1 && y > -this.maxY ) || ( this.fy == 1 && y < 0 ) ) 
       {
            this.lastTime = now;
            this.shiftTo(x, y);
            this.on_scroll(x, y);
        } else {
            clearInterval(this.timerId); this.timerId = 0;
            this.shiftTo(this.endX, this.endY);
            this.on_scroll_end(this.endX, this.endY);
        }
    }
}

dw_scrollObj.prototype.ceaseScroll = function() {
    if (!this.ready) return;
    if (this.timerId) {
        clearInterval(this.timerId); this.timerId = 0; 
    }
    this.on_scroll_stop(this.x, this.y); 
}

dw_scrollObj.handleMouseWheel = function(id, delta) {
    var wndo = dw_scrollObj.col[id];
    var x = wndo.x;
    var y = wndo.y;
    wndo.on_scroll_start(x,y);
    var ny;
    ny = 12  * delta + y
    if (ny < 0 && ny > -wndo.maxY ) {
        wndo.shiftTo(x, ny);
        wndo.on_scroll(x, ny);
    }
}

dw_scrollObj.doOnMouseWheel = function(e) {
    var delta = 0;
    if (!e) e = window.event;
    if (e.wheelDelta) { 
        delta = e.wheelDelta/120;
        if (window.opera) delta = -delta;
    } else if (e.detail) { 
        delta = -e.detail/3;
    }
    if (delta) { 
        dw_scrollObj.handleMouseWheel(this.id, delta);
    }
    if (e.preventDefault) e.preventDefault();
    e.returnValue = false;
}

dw_scrollObj.GeckoTableBugFix = function() {}

function dw_getLayerOffset(el, oCont, sOff) {
    var off = "offset" + sOff.charAt(0).toUpperCase() + sOff.slice(1);
    var val = el[off];
    while ( (el = el.offsetParent) != oCont ) 
        val += el[off];
    var clientOff = off.replace("offset", "client");
    if ( el[clientOff] ) val += el[clientOff];
    return val;
}