/* =======================================================
				 * ypSimpleScroll
				 * 3/11/2001
				 * 
				// dhtml scrolling panel featuring scrolling in any
				// direction, smooth frame-dropping animation, and a
				// few other goodies.
				//
				// 3/25/2001
				// added scrolling in any direction and initTop, initLeft
				// constructor parameters - with only 1k...
				//
				// 3/30/2001
				// fixed bug that occured when if you called scrollTo( )
				// and the new position was the same as the current
				// position. that was stupid.
				//
				// 4/02/2001
				// small bug fix - on some browsers, on slow connections
				// the script would not run at all. to be sure the doc
				// is done loading before .load() is called, the author
				// must now call the .load() method in the onload handler
				// for the page.
				//
				// 8/22/2001
				// if you tried to scroll before page was loaded it threw
				// an error. this should be fixed now.
				// 
				//
				 * http://www.youngpup.net/
				//
				// =======================================================
				// ypSimpleScroll(  id, left, top, width, height, speed, 
				//          contentWidth, initScrollLeft, 
				//          initScrollTop  )
				//
				// last three parameters are optional.
				 * ======================================================= */
				
				
				// basic methods.
				ypSimpleScroll.prototype.scrollNorth = function() { this.startScroll(90) }
				ypSimpleScroll.prototype.scrollSouth = function() { this.startScroll(270)  }
				ypSimpleScroll.prototype.scrollWest  = function() { this.startScroll(180) }
				ypSimpleScroll.prototype.scrollEast  = function() { this.startScroll(0)   }
				
				
				// start scrolling in an arbitrary direction, with an optional arbitrary speed.
				// if no speed is provided, the default speed from the constructor parameter is used.
				ypSimpleScroll.prototype.startScroll = function(deg, speed) {
				  if (this.loaded)
				  {
				    if (this.aniTimer) window.clearTimeout(this.aniTimer)
				    this.overrideScrollAngle(deg)
				
				    this.speed    = speed ? speed : this.origSpeed
				    this.lastTime = (new Date()).getTime() - this.y.minRes
				    this.aniTimer = window.setTimeout(this.gRef + ".scroll()", this.y.minRes)
				  }
				}
				
				// kills pending calls to .scroll(), resets speed
				ypSimpleScroll.prototype.endScroll = function() {
				  if (this.loaded)
				  {
				    window.clearTimeout(this.aniTimer)
				    this.aniTimer = 0;
				    this.speed = this.origSpeed
				  }
				}
				
				// override the current angle from startScroll() with a new angle
				// this method should not be used with scrollTo() because it will
				// override the angle created by the first two params to scrollTo().
				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
				  }
				}
				
				// override the speed for the current scroll.
				// should not be used with scrollTo, unless you want to 
				// override the speed computed from the aniLen param of scrollTo()
				ypSimpleScroll.prototype.overrideScrollSpeed = function(speed) {
				  if (this.loaded) this.speed = speed
				}
				
				// scroll to an arbitrary position in two dimensions over in
				// an arbitrary lenth of time.
				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)
				    }
				  }
				}
				
				// jump to an arbitrary position in two dimensions.
				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"
				    }
				  }
				}
				
				
				
				// =========================================================================
				// =============================== private =================================
				// =========================================================================
				
				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
				
				// recursively calls itself to animate
				ypSimpleScroll.prototype.scroll = function() {
				  this.aniTimer = window.setTimeout(this.gRef + ".scroll()", 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)
				    //window.status = nx + " " + this.fx + " " + this.scrollLeft + " " + this.stopH + " | " + ny + " " + this.fy + " " + this.scrollTop + " " + this.stopV + " : " + d
				    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
				    }
				  }
				}
				
				// constructor
				function ypSimpleScroll(id, left, top, width, height, speed, contentWidth, initLeft, initTop)
				{
				  var y = this.y = ypSimpleScroll
				  if (!initLeft)     initLeft     = 0
				  if (!initTop)      initTop      = 0
				  if (!contentWidth) contentWidth = width
				
				  // fix for netscape4 first-page bug.
				  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  = initTop
				    this.scrollLeft  = initLeft
				
				    // global reference to this object
				    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:' + (-initLeft) + 'px; top:' + (-initTop) + 'px; width:' + contentWidth + 'px; }')
				    d.write('</style>')
				  }
				}
				
				// once the nceesary objects are present in the DOM, this gathers some info about them.
				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)
				}