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

var offsetfrommouse = [20, -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 = 0; // maximum image size.

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

function gettrailobj() {
	if (document.getElementById)
		return document.getElementById("trailimageid").style
	else if (document.all)
		return document.all.trailimageid.style
}

function gettrailobjnostyle() {
	if (document.getElementById)
		return document.getElementById("trailimageid")
	else if (document.all)
		return document.all.trailimageid
}


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


/* LOAD THE XML FILE */
var xmlHttp;
var xmlDoc;
var glossarykey = "";
var glossarytitle = "";
var glossarydef = "Sorry, your browser does not support the glossary feature on this website. Error 1.";

/* Fix for Safari! */
if ((navigator.userAgent.indexOf('Safari') != -1)) {
	xmlHttp = new XMLHttpRequest();
	xmlHttp.open("GET", "scripts/glossary.xml", false);
	xmlHttp.send();
	xmlDoc = xmlHttp.responseXML;
}
else {

	if (window.ActiveXObject) {
		xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
	}
	else if (document.implementation.createDocument) {
		xmlDoc = document.implementation.createDocument("", "", null);
	}

	if (xmlDoc != null) {
		xmlDoc.async = false;
		xmlDoc.load("scripts/glossary.xml");
	}
	else {
		glossarydef = "Sorry, your browser does not support the glossary feature on this website. Error 2.";
	}

}



/* PULL THE DEFINITION WHEN CALLED */
function pullDefinition() {

	var xmlLength = xmlDoc.getElementsByTagName("term").length;


	for (var g = 0; g < xmlLength; g++) {

		if (xmlDoc.childNodes[0].getElementsByTagName("term")[g].attributes[0].nodeValue == glossarykey) {
			glossarytitle = xmlDoc.childNodes[0].getElementsByTagName("term")[g].attributes[1].nodeValue;
			glossarydef = xmlDoc.childNodes[0].getElementsByTagName("term")[g].attributes[2].nodeValue;
			break;
		}
		else {
			glossarytitle = "N/A";
			glossarydef = "There is no definition for this term yet.";
		}

	}

}

/* CONTROL THE GLOSSARY BOX */
// document.onmousemove=followmouse;

function showtrail(term) {

	glossarykey = term;
	if (xmlDoc != null) {
		pullDefinition();
	}
	document.onmousemove = followmouse;

	newHTML = '<div id="glossaryDef">'

	newHTML += '<b>';
	newHTML += glossarytitle;
	newHTML += '</b><br>';

	newHTML += glossarydef;

	newHTML += '</div>';

	gettrailobjnostyle().innerHTML = newHTML;
	gettrailobj().visibility = "visible";

}


function hidetrail() {
	gettrailobj().visibility = "hidden"
	document.onmousemove = ""
	gettrailobj().left = "-500px"

}

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){
	gettrailobjnostyle().innerHTML = 'A = ' + truebody().scrollHeight + '<br>B = ' + truebody().clientHeight;
	} else {
	gettrailobjnostyle().innerHTML = 'C = ' + document.body.offsetHeight + '<br>D = ' + window.innerHeight;
	}
	*/

	if (typeof e != "undefined") {
		if (docwidth - e.pageX < 380) {
			xcoord = e.pageX - xcoord - 300; // Move to the left side of the cursor
		} else {
			xcoord += e.pageX;
		}
		if (docheight - e.pageY < (currentimageheight + 110)) {
			ycoord += e.pageY - Math.max(0, (110 + currentimageheight + e.pageY - docheight - truebody().scrollTop));
		} else {
			ycoord += e.pageY;
		}

	} else if (typeof window.event != "undefined") {
		if (docwidth - event.clientX < 380) {
			xcoord = event.clientX + truebody().scrollLeft - xcoord - 300; // Move to the left side of the cursor
		} else {
			xcoord += truebody().scrollLeft + event.clientX
		}
		if (docheight - event.clientY < (currentimageheight + 110)) {
			ycoord += event.clientY + truebody().scrollTop - Math.max(0, (110 + currentimageheight + event.clientY - docheight));
		} else {
			ycoord += truebody().scrollTop + event.clientY;
		}
	}

	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; }
	gettrailobj().left = xcoord + "px"
	gettrailobj().top = ycoord + "px"

}