ypSimpleScroll.prototype.scrollNorth = function(count) { this.startScroll(90, count) }
ypSimpleScroll.prototype.scrollSouth = function(count) { this.startScroll(270, count) }
ypSimpleScroll.prototype.scrollWest = function(count) { this.startScroll(180, count) }
ypSimpleScroll.prototype.scrollEast = function(count) { this.startScroll(0, count) }

ypSimpleScroll.prototype.startScroll = function(deg, count) {
        if (this.loaded) {
                if (this.aniTimer) window.clearTimeout(this.aniTimer)
                this.overrideScrollAngle(deg)
                this.speed = this.origSpeed
                this.lastTime = (new Date()).getTime() - this.y.minRes
                this.aniTimer = window.setTimeout(this.gRef + ".scroll('" + deg + "','" + count + "')", this.y.minRes)
        }
}

ypSimpleScroll.prototype.endScroll = function() {
        if (this.loaded) {
                window.clearTimeout(this.aniTimer)
                this.aniTimer = 0;
                this.speed = this.origSpeed
        }
}

ypSimpleScroll.prototype.overrideScrollAngle = function(deg) {
        if (this.loaded) {
                deg = deg % 360
                if (deg % 90 == 0) {
                        var cos = deg == 0 ? 1 : deg == 180 ? -1 : 0
                        var sin = deg == 90 ? -1 : deg == 270 ? 1 : 0
                }
                else {
                        var angle = deg * Math.PI / 180
                        var cos = Math.cos(angle)
                        var sin = Math.sin(angle)
                        sin = -sin
                }
                this.fx = cos / (Math.abs(cos) + Math.abs(sin))
                this.fy = sin / (Math.abs(cos) + Math.abs(sin))
                this.stopH = deg == 90 || deg == 270 ? this.scrollLeft : deg < 90 || deg > 270 ? this.scrollW : 0
                this.stopV = deg == 0 || deg == 180 ? this.scrollTop : deg < 180 ? 0 : this.scrollH
        }
}

ypSimpleScroll.prototype.overrideScrollSpeed = function(speed) {
        if (this.loaded) this.speed = speed
}


ypSimpleScroll.prototype.scrollTo = function(stopH, stopV, aniLen) {
        if (this.loaded) {
                if (stopH != this.scrollLeft || stopV != this.scrollTop) {
                        if (this.aniTimer) window.clearTimeout(this.aniTimer)
                        this.lastTime = (new Date()).getTime()
                        var dx = Math.abs(stopH - this.scrollLeft)
                        var dy = Math.abs(stopV - this.scrollTop)
                        var d = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2))
                        this.fx = (stopH - this.scrollLeft) / (dx + dy)
                        this.fy = (stopV - this.scrollTop) / (dx + dy)
                        this.stopH = stopH
                        this.stopV = stopV
                        this.speed = d / aniLen * 1000
                        window.setTimeout(this.gRef + ".scroll()", this.y.minRes)
                }
        }
}

ypSimpleScroll.prototype.jumpTo = function(nx, ny) {
        if (this.loaded) {
                nx = Math.min(Math.max(nx, 0), this.scrollW)
                ny = Math.min(Math.max(ny, 0), this.scrollH)
                this.scrollLeft = nx
                this.scrollTop = ny
                if (this.y.ns4) this.content.moveTo(-nx, -ny)
                else {
                        this.content.style.left = -nx + "px"
                        this.content.style.top = -ny + "px"
                }
        }
}

ypSimpleScroll.minRes = 10
ypSimpleScroll.ie = document.all ? 1 : 0
ypSimpleScroll.ns4 = document.layers ? 1 : 0
ypSimpleScroll.dom = document.getElementById ? 1 : 0
ypSimpleScroll.mac = navigator.platform == "MacPPC"
ypSimpleScroll.mo5 = document.getElementById && !document.all ? 1 : 0

ypSimpleScroll.prototype.scroll = function(deg, count) {
        this.aniTimer = window.setTimeout(this.gRef + ".scroll('" + deg + "','" + count + "')", this.y.minRes)
        var nt = (new Date()).getTime()
        var d = Math.round((nt - this.lastTime) / 1000 * this.speed)
        if (d > 0) {
                var nx = d * this.fx + this.scrollLeft
                var ny = d * this.fy + this.scrollTop
                var xOut = (nx >= this.scrollLeft && nx >= this.stopH) || (nx <= this.scrollLeft && nx <= this.stopH)
                var yOut = (ny >= this.scrollTop && ny >= this.stopV) || (ny <= this.scrollTop && ny <= this.stopV)
                if (nt - this.lastTime != 0 &&
      ((this.fx == 0 && this.fy == 0) ||
      (this.fy == 0 && xOut) ||
      (this.fx == 0 && yOut) ||
      (this.fx != 0 && this.fy != 0 &&
      xOut && yOut))) {
                        this.jumpTo(this.stopH, this.stopV)
                        this.endScroll()
                }
                else {
                        this.jumpTo(nx, ny)
                        this.lastTime = nt
                }
                // (zgtc) now we also update dragger position:
                if (deg == '270') theThumb[count].style.top = parseInt(((theThumb[count].maxY - theThumb[count].minY) * this.scrollTop / this.stopV) + theThumb[count].minY) + "px"; //ok nomes down
                if (deg == '90') theThumb[count].style.top = parseInt(((theThumb[count].maxY - theThumb[count].minY) * this.scrollTop / this.scrollH) + theThumb[count].minY) + "px"; //ok nomes down
        }
}

function ypSimpleScroll(id, left, top, width, height, speed) {
        var y = this.y = ypSimpleScroll
        if (document.layers && !y.ns4) history.go(0)
        if (y.ie || y.ns4 || y.dom) {
                this.loaded = false
                this.id = id
                this.origSpeed = speed
                this.aniTimer = false
                this.op = ""
                this.lastTime = 0
                this.clipH = height
                this.clipW = width
                this.scrollTop = 0
                this.scrollLeft = 0
                this.gRef = "ypSimpleScroll_" + id
                eval(this.gRef + "=this")
                var d = document
                d.write('<style type="text/css">')
                d.write('#' + this.id + 'Container { left:' + left + 'px; top:' + top + 'px; width:' + width + 'px; height:' + height + 'px; clip:rect(0 ' + width + ' ' + height + ' 0); overflow:hidden; }')
                d.write('#' + this.id + 'Container, #' + this.id + 'Content { position:absolute; }')
                d.write('#' + this.id + 'Content { left:' + (-this.scrollLeft) + 'px; top:' + (-this.scrollTop) + 'px; width:' + width + 'px; }')
                // (zgtc) fix to overwrite p/div/ul width (would be clipped if wider than scroller in css):
                d.write('#' + this.id + 'Container p, #' + this.id + 'Container div {width:' + parseInt(width - 10) + 'px; }')
                d.write('</style>')
        }
}

ypSimpleScroll.prototype.load = function() {
        var d, lyrId1, lyrId2
        d = document
        lyrId1 = this.id + "Container"
        lyrId2 = this.id + "Content"
        this.container = this.y.dom ? d.getElementById(lyrId1) : this.y.ie ? d.all[lyrId1] : d.layers[lyrId1]
        this.content = obj2 = this.y.ns4 ? this.container.layers[lyrId2] : this.y.ie ? d.all[lyrId2] : d.getElementById(lyrId2)
        this.docH = Math.max(this.y.ns4 ? this.content.document.height : this.content.offsetHeight, this.clipH)
        this.docW = Math.max(this.y.ns4 ? this.content.document.width : this.content.offsetWidth, this.clipW)
        this.scrollH = this.docH - this.clipH
        this.scrollW = this.docW - this.clipW
        this.loaded = true
        this.scrollLeft = Math.max(Math.min(this.scrollLeft, this.scrollW), 0)
        this.scrollTop = Math.max(Math.min(this.scrollTop, this.scrollH), 0)
        this.jumpTo(this.scrollLeft, this.scrollTop)
}