// JavaScript Document
/*
Simple Image Trail script- By JavaScriptKit.com
Visit http://www.javascriptkit.com for this script and more
This notice must stay intact

Modified by Tim Kroeger (tim@breakmyzencart.com) for use with
image handler 2 and better cross browser functionality
*/

var offsetfrommouse=[10,10]; //image x,y offsets from cursor position in pixels. Enter 0,0 for no offset
var displayduration=0; //duration in seconds image should remain visible. 0 for always.
var currentimageheight = 400; // maximum image size.
var padding=10; // padding must by larger than specified div padding in stylessheet

// Global variables for sizes of hoverimg
// Defined in "showtrail()", used in "followmouse()"
var zoomimg_w=0;
var zoomimg_h=0;


if (document.getElementById || document.all){
 document.write('<div id="trailimageid">');
 document.write('</div>');
}

function getObj(name) {
 if (document.getElementById) {
 this.obj = document.getElementById(name);
 this.style = document.getElementById(name).style;
 } else if (document.all) {
 this.obj = document.all[name];
 this.style = document.all[name].style;
 } else if (document.layers) {
 this.obj = document.layers[name];
 this.style = document.layers[name];
 }
}

function gettrail(){
 return new getObj("trailimageid");
}

function truebody(){
 return (!window.opera && document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
}

function showtrail(imagename,title,oriwidth,oriheight,zoomimgwidth,zoomimgheight, image, startx, starty, startw, starth){
 zoomimg_w=zoomimgwidth;
 zoomimg_h=zoomimgheight;
 //if (oriwidth > 0){ offsetfrommouse[0] = oriwidth; }
 //if (oriheight > 0){ offsetfrommouse[1] = -1 *(zoomimgheight-oriheight)/2 - 40; }
 // alert (offsetfrommouse[0] + "," + offsetfrommouse[1]);
 if (zoomimgheight > 0){ currentimageheight = zoomimgheight; }
 trailobj = gettrail().obj;
 trailobj.style.width=(zoomimgwidth+(2*padding))+"px";
 trailobj.style.height=(zoomimgheight+(2*padding))+"px";
 trailobj.setAttribute("startx", startx);
 trailobj.setAttribute("starty", starty);
 trailobj.setAttribute("startw", startw);
 trailobj.setAttribute("starth", starth);
 trailobj.setAttribute("imagename", imagename);
 trailobj.setAttribute("imgtitle", title);
 document.onmousemove=followmouse;
}

function hidetrail(){
 trailstyle = gettrail().style;
 trailstyle.visibility = "hidden";
 document.onmousemove = "";
 trailstyle.left = "-2000px";
 trailstyle.top = "-2000px";
}

function followmouse(e){

 var xcoord=offsetfrommouse[0];
 var ycoord=offsetfrommouse[1];

 var docwidth=document.all? truebody().scrollLeft+truebody().clientWidth : pageXOffset+window.innerWidth-15;
 var docheight=document.all? Math.min(truebody().scrollHeight, truebody().clientHeight) : Math.min(window.innerHeight);

 //if (document.all){
 // trail.obj.innerHTML = 'A = ' + truebody().scrollHeight + '<br>B = ' + truebody().clientHeight;
 //} else {
 // trail.obj.innerHTML = 'C = ' + document.body.offsetHeight + '<br>D = ' + window.innerHeight;
 //}
 var relativeX = null;
 var relativeY = null;

 if (typeof e != "undefined"){
 if ((typeof e.layerX != "undefined") && (typeof e.layerY != "undefined")) {
 relativeX = e.layerX;
 relativeY = e.layerY;
 } else if ((typeof e.x != "undefined") && (typeof e.y != "undefined")) {
 relativeX = e.x;
 relativeY = e.y;
 }

 if (docwidth - e.pageX < zoomimg_w + (3 * padding)) {
 xcoord = e.pageX - xcoord - zoomimg_w - (2 * offsetfrommouse[0]);
 } else {
 xcoord += e.pageX;
 }
 if (docheight - e.pageY < zoomimg_h + (2 * padding)){
 ycoord += e.pageY - Math.max(0,(0 + zoomimg_h + (5 * padding) + e.pageY - docheight - truebody().scrollTop));
 } else {
 ycoord += e.pageY;
 }
 } else if (typeof window.event != "undefined"){
 if ((typeof event.x != "undefined") && (typeof event.y != "undefined")) {
 relativeX = event.x;
 relativeY = event.y;
 } else if ((typeof event.offsetX != "undefined") && (event.offsetY != "undefined")) {
 relativeX = event.offsetX;
 relativeY = event.offsetY;
 }

 if (docwidth - event.clientX < zoomimg_w + (3 * padding)) {
 xcoord = event.clientX - xcoord - zoomimg_w - (2 * offsetfrommouse[0]);
 } else {
 xcoord += truebody().scrollLeft+event.clientX;
 }
 if (docheight - event.clientY < zoomimg_h + (2 * padding)){
 ycoord += event.clientY - Math.max(0,(0 + zoomimg_h + (5 * padding) + e.pageY - docheight - truebody().scrollTop));
 } else {
 ycoord += truebody().scrollTop + event.clientY;
 }
 }

 trail = gettrail();
 startx = trail.obj.getAttribute("startx");
 starty = trail.obj.getAttribute("starty");
 startw = trail.obj.getAttribute("startw");
 starth = trail.obj.getAttribute("starth");
 imagename = trail.obj.getAttribute("imagename");
 title = trail.obj.getAttribute("imgtitle");

 // calculate and set position BEFORE switching to visible
 var docwidth=document.all? truebody().scrollLeft+truebody().clientWidth : pageXOffset+window.innerWidth-15;
 var docheight=document.all? Math.max(truebody().scrollHeight, truebody().clientHeight) : Math.max(document.body.offsetHeight, window.innerHeight);
 if(ycoord < 0) { ycoord = ycoord*-1; }
 if ((trail.style.left == "-2000px") || (trail.style.left == "")) { trail.style.left=xcoord+"px"; }
 if ((trail.style.top == "-2000px") || (trail.style.top == "")) { trail.style.top=ycoord+"px"; }
 trail.style.left=xcoord+"px";
 trail.style.top=ycoord+"px";
// alert (trail.style.left+","+trail.style.top);

 if (trail.style.visibility != "visible") {
 if (((relativeX == null) || (relativeY == null)) ||
 ((relativeX >= startx) && (relativeX <= (startx + startw))
 && (relativeY >= starty) && (relativeY <= (starty + starth)))){
 newHTML = '<div><h1>' + title + '</h1>';
 newHTML = newHTML + '<img src="' + imagename + '"></div>';
 trail.obj.innerHTML = newHTML;
 trail.style.visibility="visible";
 }
 }
}