/* Class Of Marquee Scroll
Usage :
　1.include the js class file in a page by code below
    <script type="text/javascript" src="MSClass.js"></script>
  2.create a instance by code below
	new Marquee("marquee",0,1,760,104,50,5000,3000,52)
    parameter description
	(1)    marquee	DOM Id of the container
	(2)	 0		scroll to top (0 to top , 1 down 2to left 3 to right )
	(3)	 1		step of scroll, the bigger data is,the faster roll goes
	(4)	 760	width of the container
	(5)	 52		height of the container
	(6)	 50		timer best is > 20, the small data is ,the faster roll goes. 1000=1s
	(7)	 5000	pause time  at process (0 disable the feature ,1000 = 1s )
	(8)	 3000	wait time at begin (0 no wait ,1000=1s)
	(9)	 (52)	optional ,if this and (7) is 0,then feature is on mouse
　other suggestion
		1、define the width and height of the container. i.e <div id="marquee" style="width:760px;height:52px;">......</div>)
		2、add s style(overflow=auto) to container  i.e <div id="marquee" style="width:760px;height:52px;overflow:auto;">......</div>)
*/

function Marquee()
{
	this.ID = document.getElementById(arguments[0]);
	this.Direction = arguments[1];
	this.Step = this.BakStep = arguments[2];
	this.Width = arguments[3];
	this.HalfWidth = Math.round(arguments[3] / 2);
	this.Height = arguments[4];
	this.Timer = arguments[5];
	this.DelayTime = arguments[6];
	this.WaitTime = arguments[7];
	if(arguments[8] || arguments[8]==0)
		this.ScrollStep = arguments[8]
	else
		this.ScrollStep = this.Direction > 1 ? this.Width : this.Height;
	this.Correct = this.CTL = this.StartID = this.Stop = this.MouseOver = 0;
	this.ID.style.overflow = this.ID.style.overflowX = this.ID.style.overflowY = "hidden";
	this.ID.noWrap = true;
	this.ID.style.width = this.Width;
	this.ID.style.height = this.Height;
	this.ClientScroll = this.Direction > 1 ? this.ID.scrollWidth : this.ID.scrollHeight;
	this.ID.innerHTML += this.ID.innerHTML;
	this.IsNotOpera = (navigator.userAgent.toLowerCase().indexOf("opera") == -1);
	if(arguments.length >= 8)this.Start(this,this.Timer,this.DelayTime,this.WaitTime);
}

Marquee.prototype.Start = function(msobj,timer,delaytime,waittime)
{
	msobj.StartID = function(){msobj.Scroll()}
	msobj.Continue = function()
				{
					if(msobj.MouseOver == 1)
					{
						setTimeout(msobj.Continue,delaytime);
					}
					else
					{	clearInterval(msobj.TimerID);
						msobj.CTL = msobj.Stop = 0;
						msobj.TimerID = setInterval(msobj.StartID,timer);
					}
				}

	msobj.Pause = function()
			{
				msobj.Stop = 1;
				clearInterval(msobj.TimerID);
				setTimeout(msobj.Continue,delaytime);
			}

	msobj.Begin = function()
		{
			msobj.ID.onmousemove = function(event)
						{
							if(msobj.ScrollStep == 0 && msobj.Direction > 1)
							{
								var event = event || window.event;
								if(window.event)
								{
									if(msobj.IsNotOpera)
									{
										msobj.EventLeft = event.srcElement.id == msobj.ID.id ? event.offsetX - msobj.ID.scrollLeft : event.srcElement.offsetLeft - msobj.ID.scrollLeft + event.offsetX;
									}
									else
									{
										msobj.ScrollStep = null;
										return;
									}
								}
								else
								{
									msobj.EventLeft = event.layerX - msobj.ID.scrollLeft;
								}
								msobj.Direction = msobj.EventLeft > msobj.HalfWidth ? 3 : 2;
								msobj.AbsCenter = Math.abs(msobj.HalfWidth - msobj.EventLeft);
								msobj.Step = Math.round(msobj.AbsCenter * (msobj.BakStep*2) / msobj.HalfWidth);
							}
						}
			msobj.ID.onmouseover = function()
						{
							if(msobj.ScrollStep == 0)return;
							msobj.MouseOver = 1;
							clearInterval(msobj.TimerID);
						}
			msobj.ID.onmouseout = function()
						{
							if(msobj.ScrollStep == 0)
							{
								if(msobj.Step == 0)msobj.Step = 1;
								return;
							}
							msobj.MouseOver = 0;
							if(msobj.Stop == 0)
							{
								clearInterval(msobj.TimerID);
								msobj.TimerID = setInterval(msobj.StartID,timer);
							}
						}
			msobj.TimerID = setInterval(msobj.StartID,timer);
		}
	setTimeout(msobj.Begin,waittime);
}

Marquee.prototype.Scroll = function()
{
	if(this.Correct == 0 && this.CTL > this.ClientScroll)
	{
		this.ClientScroll = this.Direction > 1 ? Math.round(this.ID.scrollWidth / 2) : Math.round(this.ID.scrollHeight / 2);
		this.Correct = 1;
	}

	switch(this.Direction)
	{
		case 0:
			this.CTL += this.Step;
			if(this.CTL >= this.ScrollStep && this.DelayTime > 0)
			{
				this.ID.scrollTop += this.ScrollStep + this.Step - this.CTL;
				this.Pause();
				return;
			}
			else
			{
				if(this.ID.scrollTop >= this.ClientScroll)
				{
					this.ID.scrollTop -= this.ClientScroll;
				}
				this.ID.scrollTop += this.Step;
			}
		break;

		case 1:
			this.CTL += this.Step;
			if(this.CTL >= this.ScrollStep && this.DelayTime > 0)
			{
				this.ID.scrollTop -= this.ScrollStep + this.Step - this.CTL;
				this.Pause();
				return;
			}
			else
			{
				if(this.ID.scrollTop <= 0)
				{
					this.ID.scrollTop += this.ClientScroll;
				}
				this.ID.scrollTop -= this.Step;
			}
		break;

		case 2:
			this.CTL += this.Step;
			if(this.CTL >= this.ScrollStep && this.DelayTime > 0)
			{
				this.ID.scrollLeft += this.ScrollStep + this.Step - this.CTL;
				this.Pause();
				return;
			}
			else
			{
				if(this.ID.scrollLeft >= this.ClientScroll)
				{
					this.ID.scrollLeft -= this.ClientScroll;
				}
				this.ID.scrollLeft += this.Step;
			}
		break;

		case 3:
			this.CTL += this.Step;
			if(this.CTL >= this.ScrollStep && this.DelayTime > 0)
			{
				this.ID.scrollLeft -= this.ScrollStep + this.Step - this.CTL;
				this.Pause();
				return;
			}
			else
			{
				if(this.ID.scrollLeft <= 0)
				{
					this.ID.scrollLeft += this.ClientScroll;
				}
				this.ID.scrollLeft -= this.Step;
			}
		break;
	}
}