/********************************/
/******** Detect Browser ********/
/********************************/
var agent = navigator.userAgent.toLowerCase();
var isFF = (agent.indexOf('firefox') != -1);
var isIE = (agent.indexOf('msie') != -1);
var isSA = (agent.indexOf('safari') != -1);



/****************************************/
/******** Create an OnLoad Event ********/
/****************************************/
window.onload = initPage;
function initPage () {
	document.onmousedown = pickIt;   //Needed for dragging objects
	document.onmousemove = dragIt;   //Needed for dragging objects
	document.onmouseup = dropIt;   //Needed for dragging objects
}



/******************************/
/******** Follow Mouse ********/
/******************************/
function startFollow() {
	document.onmousemove = followMe;
}
function stopFollow() {
	document.onmousemove = null;
}
function followMe(evt) {
	var evt = (evt) ? evt : ((window.event) ? window.event : null);
	var object = document.getElementById('crosshair');
	object.style.left = evt.clientX - (object.offsetWidth/2) + 'px';
	object.style.top = evt.clientY - (object.offsetHeight/2) + 'px';
	return;
}



/******************************/
/******** Drag Objects ********/
/******************************/
var object = null;
var cX =  0;
var cY = 0;
function pickIt(evt) {
	var evt = (evt) ? evt : ((window.event) ? event : null);
	var objectID = (evt.target) ? evt.target.id : ((evt.srcElement) ? evt.srcElement.id : null);
	if ((objectID.indexOf('can')!=-1)||(objectID.indexOf('memo')!=-1))  object = document.getElementById(objectID);
	if (object) { 
		object.style.zIndex = 100;
		cX = evt.clientX - object.offsetLeft;
		cY = evt.clientY - object.offsetTop;
		return;
	}
	else {
		object = null;
		return;
	}
}
function dragIt(evt) {
	evt = (evt) ? evt : ((window.event) ? event : null);
	if (object) {
		object.style.left = evt.clientX - cX + 'px';
		object.style.top = evt.clientY - cY + 'px';
		return false;
	}
}
function dropIt() {
	if (object) {	
		object.style.zIndex = 0;
		object = null;
		return false;
	}
}



/***************************************************/
/******** Preserve PNG Transparencies in IE ********/
/***************************************************/
function correctPNG() // correctly handle PNG transparency in Win IE 5.5 & 6.
{
   var arVersion = navigator.appVersion.split("MSIE")
   var version = parseFloat(arVersion[1])
   if ((version >= 5.5) && (document.body.filters)) 
   {
      for(var i=0; i<document.images.length; i++)
      {
         var img = document.images[i]
         var imgName = img.src.toUpperCase()
         if (imgName.substring(imgName.length-3, imgName.length) == "PNG")
         {
            var imgID = (img.id) ? "id='" + img.id + "' " : ""
            var imgClass = (img.className) ? "class='" + img.className + "' " : ""
            var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' "
            var imgStyle = "display:inline-block;" + img.style.cssText 
            if (img.align == "left") imgStyle = "float:left;" + imgStyle
            if (img.align == "right") imgStyle = "float:right;" + imgStyle
            if (img.parentElement.href) imgStyle = "cursor:hand;" + imgStyle
            var strNewHTML = "<span " + imgID + imgClass + imgTitle
            + " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";"
            + "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
            + "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>" 
            img.outerHTML = strNewHTML
            i = i-1
         }
      }
   }    
}
if(isIE){
	window.attachEvent("onload", correctPNG);
}


/*********************************/
/******** Initialize AJAX ********/
/*********************************/
function getXMLHttp() {
	var XMLHttp = null;
	if(window.XMLHttpRequest) {
		try {
			XMLHttp = new XMLHttpRequest();
		} catch (e) {}
	} else if(window.ActiveXObject) {
		try {
			XMLHttp = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				XMLHttp = new ActiveXObject("Microsoft.XMLHttp");
			} catch (e) {}
		}
	}
	return XMLHttp;
}
/*****************************/
/******** GET Request ********/
/*****************************/
/*
var XMLHttp = getXMLHttp();
XMLHttp.open("GET", "assets/test.txt");
XMLHttp.onreadystatechange = handlerFunction;
XMLHttp.send(null);
function handlerFunction() {
	if(XMLHttp.readyState == 4) {
		window.alert("Returned data: " + XMLHttp.responseText);
	}
}
*/
/******************************/
/******** POST Request ********/
/******************************/
/*
var XMLHttp = getXMLHttp();
XMLHttp.open("POST", "assets/test.txt");
XMLHttp.onreadystatechange = handlerFunction;
XMLHttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
XMLHttp.send("word1=JavaScript&word2=Phrasebook");
function handlerFunction() {
	if(XMLHttp.readyState == 4) {
		alert("Returned data: " + XMLHttp.responseText);
		//*** SPLIT DATA ***
		var data = XMLHttp.responseText.split("\n");
		alert(data[0] + " ... " + data[3]);
		//*** RETRIEVE HTTP HEADERS ***
		var servertype = XMLHttp.getResponseHeader("Server");
		alert(servertype);
	}
}
*/
/*********************/
/******** XML ********/
/*********************/
/*
var XMLHttp = getXMLHttp();
XMLHttp.open("GET", "http://news.google.com/news?q=Radio+Astronomy&ie=UTF-8&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&tab=wn&output=atom");
XMLHttp.onreadystatechange = handlerFunction;
XMLHttp.send(null);
function handlerFunction() {
	if(XMLHttp.readyState == 4) {
		var xml = XMLHttp.responseXML;
		var title = xml.getElementsByTagName("title")[0].firstChild.nodeValue;
		//var pubdate = book.getAttribute("pubdate");
		//var title, publisher;
		for (i=0; i<book.childNodes.length; i++) {
			if(book.childNodes[i].nodeName == "title") {
				title = book.childNodes[i].firstChild.nodeValue;
			} else if (book.childNodes[i].nodeName == "publisher") {
				publisher = book.childNodes[i].firstChild.nodeValue;
			}
		}
		alert(title);
	}
}*/