// JavaScript Document

/********************************************************
Create a div with transparent place holder in your html
<div id="Book" style="position:relative">
<img src="placeholder.gif" width="300" height="380">
</div>
width = 2*book image width +4 height = book image height+2

Insert onload in body tag
<body onload="ImageBook()">
*********************************************************/
	// 7 variables to control behavior
	var Book_Image_Width = 160;
	var Book_Image_Height = 120;
	var Book_Border = true;
	var Book_Border_Color = "gray";
	var Book_Speed = 15;
	var Book_NextPage_Delay = 1500; //1 second=1000
	var Book_Vertical_Turn = 0;

	// array to specify images and optional links. At least 4
	// If Link is not needed keep it ""

	Book_Image_Sources=new Array
	(
		"images/img01.jpg","http://......",
		"images/img02.jpg","http://............",
		"images/img03.jpg","", //this slide isn't linked
		"images/img04.jpg","http://..........." // NOTE No comma after last line
	);

	/***************** DO NOT EDIT BELOW **********************************/
	var B_LI,B_MI,B_RI,B_TI,B_Angle=0,B_CrImg=6,B_MaxW,B_Direction=1;
	var B_MSz,B_Stppd=false;B_Pre_Img=new Array(Book_Image_Sources.length);

	function ImageBook(width, height, images)
	{
		if(width)
		{
			Book_Image_Width = width;
		}
		if(height)
		{
			Book_Image_Height = height;
		}
		if(images)
		{
			Book_Image_Sources = images;
		}
		
		if(document.getElementById)
		{
			for(i=0;i<Book_Image_Sources.length;i+=2)
			{
				B_Pre_Img[i]=new Image();
				B_Pre_Img[i].src=Book_Image_Sources[i]
			}
			
			Book_Div=document.getElementById("Book");
			B_LI=document.createElement("img");Book_Div.appendChild(B_LI);
			B_RI=document.createElement("img");Book_Div.appendChild(B_RI);
			B_MI=document.createElement("img");Book_Div.appendChild(B_MI);
			B_LI.style.position=B_MI.style.position=B_RI.style.position="absolute";
			B_LI.style.zIndex=B_RI.style.zIndex=0;B_MI.style.zIndex=1;
			B_LI.style.top=(Book_Vertical_Turn?Book_Image_Height+1:0)+"px";
			B_LI.style.left=0+"px";
			B_MI.style.top=0+"px";
			B_MI.style.left=(Book_Vertical_Turn?0:Book_Image_Width+1)+"px";
			B_RI.style.top=0+"px";
			B_RI.style.left=(Book_Vertical_Turn?0:Book_Image_Width+1)+"px";
			B_LI.style.height=Book_Image_Height+"px";
			B_MI.style.height=Book_Image_Height+"px";
			B_RI.style.height=Book_Image_Height+"px";
			B_LI.style.width=Book_Image_Width+"px";
			B_MI.style.width=Book_Image_Width+"px";
			B_RI.style.width=Book_Image_Width+"px";
		
			if(Book_Border)
			{
				B_LI.style.borderStyle=B_MI.style.borderStyle=B_RI.style.borderStyle="solid";
				B_LI.style.borderWidth=1+"px";
				B_MI.style.borderWidth=1+"px";
				B_RI.style.borderWidth=1+"px";
				B_LI.style.borderColor=B_MI.style.borderColor=B_RI.style.borderColor=Book_Border_Color
			}
			
			B_LI.src=B_Pre_Img[0].src;
			B_LI.lnk=Book_Image_Sources[1];
			B_MI.src=B_Pre_Img[2].src;
			B_MI.lnk=Book_Image_Sources[3];
			B_RI.src=B_Pre_Img[4].src;
			B_RI.lnk=Book_Image_Sources[5];
			B_LI.onclick=B_MI.onclick=B_RI.onclick=B_LdLnk;
			B_LI.onmouseover=B_MI.onmouseover=B_RI.onmouseover=B_Stp;
			B_LI.onmouseout=B_MI.onmouseout=B_RI.onmouseout=B_Rstrt;
			BookImages()
		}
	}

	function BookImages()
	{
		if(!B_Stppd)
		{
			if(Book_Vertical_Turn)
			{
				B_MSz=Math.abs(Math.round(Math.cos(B_Angle)*Book_Image_Height));
				MidOffset=!B_Direction?Book_Image_Height+1:Book_Image_Height-B_MSz;
				B_MI.style.top=MidOffset+"px";
				B_MI.style.height=B_MSz+"px"
			}
			else
			{ 
				B_MSz=Math.abs(Math.round(Math.cos(B_Angle)*Book_Image_Width));
				MidOffset=B_Direction?Book_Image_Width+1:Book_Image_Width-B_MSz;
				B_MI.style.left=MidOffset+"px";
				B_MI.style.width=B_MSz+"px"
			}
			
			B_Angle+=Book_Speed/720*Math.PI;
			
			if(B_Angle>=Math.PI/2&&B_Direction)
			{
				B_Direction=0;
				if(B_CrImg==Book_Image_Sources.length)B_CrImg=0;
				B_MI.src=B_Pre_Img[B_CrImg].src;
				B_MI.lnk=Book_Image_Sources[B_CrImg+1];
				B_CrImg+=2
			}
			
			if(B_Angle>=Math.PI)
			{
				B_Direction=1;
				B_TI=B_LI;
				B_LI=B_MI;
				B_MI=B_TI;
				
				if(Book_Vertical_Turn)
				{
					B_MI.style.top=0+"px";
				}
				else 
				{
					B_MI.style.left=Book_Image_Width+1+"px";
				}
				
				B_MI.src=B_RI.src;
				B_MI.lnk=B_RI.lnk;

				setTimeout("Book_Next_Delay()",Book_NextPage_Delay)
			}
			else 
			{
				setTimeout("BookImages()",50)
			}
		}
		else 
		{
			setTimeout("BookImages()",50)
		}
	}

	function Book_Next_Delay()
	{
		if(B_CrImg==Book_Image_Sources.length)
		{
			B_CrImg=0;
		}
		
		B_RI.src=B_Pre_Img[B_CrImg].src;
		B_RI.lnk=Book_Image_Sources[B_CrImg+1];
		B_MI.style.zIndex=2;
		B_LI.style.zIndex=1;
		B_Angle=0;
		B_CrImg+=2;
		setTimeout("BookImages()",50)
	}

	function B_LdLnk()
	{
		if(this.lnk)
		{
			window.location.href=this.lnk
		}
	}
	
	function B_Stp()
	{
		B_Stppd=true;
		this.style.cursor=this.lnk?"pointer":"default"
	}
	
	function B_Rstrt()
	{
		B_Stppd=false
	}
