dw_scrollObj.stopScroll=function(wnId){
if(dw_scrollObjs[wnId])dw_scrollObjs[wnId].endScroll()}
dw_scrollObj.doubleSpeed=function(wnId){
if(dw_scrollObjs[wnId])dw_scrollObjs[wnId].speed*=2}
dw_scrollObj.resetSpeed=function(wnId){
if(dw_scrollObjs[wnId])dw_scrollObjs[wnId].speed/=2}
dw_scrollObj.initScroll=function(wnId,deg,sp){
if(dw_scrollObjs[wnId]){
var cosine,sine
if(typeof deg=="string"){
switch(deg){
case "up" : deg=90;break
case "down" : deg=270;break
case "left" : deg=180;break
case "right" : deg=0;break
default:
alert("Direction of scroll in mouseover scroll links should be 'up', 'down', 'left', 'right' or number: 0 to 360.")}}
deg=deg % 360
if(deg % 90==0){
cosine=(deg==0)?-1:(deg==180)? 1: 0
sine=(deg==90)? 1:(deg==270)?-1: 0
}else{
var angle=deg*Math.PI/180
cosine=-Math.cos(angle);sine=Math.sin(angle)}
dw_scrollObjs[wnId].fx=cosine/(Math.abs(cosine)+Math.abs(sine))
dw_scrollObjs[wnId].fy=sine/(Math.abs(cosine)+Math.abs(sine))
dw_scrollObjs[wnId].endX=(deg==90 || deg==270)? dw_scrollObjs[wnId].x:
(deg<90 || deg>270)?-dw_scrollObjs[wnId].maxX: 0
dw_scrollObjs[wnId].endY=(deg==0 || deg==180)? dw_scrollObjs[wnId].y:
(deg<180)? 0:-dw_scrollObjs[wnId].maxY
dw_scrollObjs[wnId].startScroll(sp)}}
dw_scrollObj.prototype.startScroll=function(speed){
if(!this.ready)return;if(this.timerId)clearInterval(this.timerId)
this.speed=speed || dw_scrollObj.speed
this.lyr=document.getElementById(this.lyrId)
this.lastTime=(new Date()).getTime()
this.on_scroll_start()
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+this.fx*d;var y=this.y+this.fy*d
if(this.fx==0 || this.fy==0){
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(this.lyr,x,y)
this.on_scroll(x,y)
}else{
clearInterval(this.timerId);this.timerId=0
this.shiftTo(this.lyr,this.endX,this.endY)
this.on_scroll_end(this.endX,this.endY)}
}else{
if((this.fx<0&&x>=-this.maxX&&this.fy<0&&y>=-this.maxY)||
(this.fx>0&&x<=0&&this.fy>0&&y<=0)||
(this.fx<0&&x>=-this.maxX&&this.fy>0&&y<=0)||
(this.fx>0&&x<=0&&this.fy<0&&y>=-this.maxY)){
this.lastTime=now
this.shiftTo(this.lyr,x,y)
this.on_scroll(x,y)
}else{
clearInterval(this.timerId);this.timerId=0
this.on_scroll_end(this.x,this.y)}}}}
dw_scrollObj.prototype.endScroll=function(){
if(!this.ready)return
if(this.timerId)clearInterval(this.timerId)
this.timerId=0;this.lyr=null}
dw_scrollObj.prototype.on_scroll=function(){}
dw_scrollObj.prototype.on_scroll_start=function(){}
dw_scrollObj.prototype.on_scroll_end=function(){}