var xmlHttp = createXmlHttpRequestObject();

function createXmlHttpRequestObject() {
	var xmlHttp;
	if (window.ActiveXObject) {
		try {
			xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
		} catch (e) {
			xmlHttp = false;
		}
	} else {
		try {
			xmlHttp = new XMLHttpRequest();
		} catch (e) {
			xmlHttp = false;
		}
	}
	if (!xmlHttp)
		alert ("Ошибка создания объекта xmlHttp");
	else
		return xmlHttp;
}

function show(value) {
	if (xmlHttp.readyState == 4 || xmlHttp.readyState == 0) {
		var wscreen = document.body.clientWidth;
		var hscreen = document.body.clientHeight;
		var lscroll = document.body.scrollLeft;
		var tscroll = document.body.scrollTop;
		var queryUrl = "/getimage.php?file=" + value + "&wscreen=" + wscreen + "&hscreen=" + hscreen + "&lscroll=" + lscroll + "&tscroll=" + tscroll;
		xmlHttp.open("GET", queryUrl, true);
		xmlHttp.onreadystatechange = handleServerResponse;
		xmlHttp.send(null)
	} else
		setTimeout('show(value)',1000);
}

function handleServerResponse() {
	if (xmlHttp.readyState == 4) {
		if (xmlHttp.status == 200) {
			var xmlResponse = xmlHttp.responseXML;
			xmlRoot = xmlResponse.documentElement;
			param = xmlRoot.getElementsByTagName("param");
			document.getElementById("imgdiv").innerHTML = '<img src="/img.php?img=' + param.item(0).firstChild.data + '&w=' + param.item(1).firstChild.data + '&h=' + param.item(2).firstChild.data + '" border="0" alt="" width="' + param.item(1).firstChild.data + '" height="' + param.item(2).firstChild.data + '">';
			document.getElementById('divimg').style.top = param.item(3).firstChild.data;
			document.getElementById('divimg').style.left = param.item(4).firstChild.data;
			document.getElementById('divimg').style.visibility = 'visible';
		} else {
			alert ("При обращении к серверу возникли проюблемы: " + xmlHttp.statusText);
		}
	}
}

function hide() {
	document.getElementById('divimg').style.visibility = 'hidden';
			document.getElementById("imgdiv").innerHTML = '';
			document.getElementById('divimg').style.top = 0;
			document.getElementById('divimg').style.left = 0;
}