window.onload = initAll;
var xhr = false;
var xPos, yPos;

function initAll() {	
	var previewLinks = Core.getElementsByClass("previewLink");
	
	for (var i=0; i< previewLinks.length; i++) {
		previewLinks[i].onmouseover = showPreview;
	}	
}

function showPreview(evt) {
	if (evt) {
		var url = evt.target;				
	}
	else {
		evt = window.event;
		var url = evt.srcElement;
	}
	
	var urlpath = url.href;
	var newurl = urlpath.replace("view","preview");
	xPos = evt.clientX;
	yPos = evt.clientY;
	
	if (window.XMLHttpRequest) {
		xhr = new XMLHttpRequest();
	}
	else {
		if (window.ActiveXObject) {
			try {
				xhr = new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch (e) { }
		}
	}

	if (xhr) {
		xhr.onreadystatechange = showContents;
		xhr.open("GET", newurl, true);
		xhr.send(null);
	}
	else {
		alert("Sorry, but I couldn't create an XMLHttpRequest");
	}
	return false;
}

function showContents() {
	if (xhr.readyState == 4) {
		if (xhr.status == 200) {
			var outMsg = xhr.responseText;
		}
		else {
			var outMsg = "There was a problem with the request " + xhr.status;
		}

		var prevWin = document.getElementById("previewWin");
		prevWin.innerHTML = outMsg;
		prevWin.style.top = parseInt(yPos)-200 + "px";
		prevWin.style.left = parseInt(xPos)+20 + "px";
		prevWin.style.visibility = "visible";
		
		var closePreview = document.getElementById("closePreview");
		closePreview.onclick = function() {
			document.getElementById("previewWin").style.visibility = "hidden";
		}
	}
}