function vytvorXmlHttpRequestObjekt () {
	var xmlHttp;
	try {
		xmlHttp = new XMLHttpRequest();
	}
	catch (e) {
		try {
			xmlHttp = new ActiveXObject ("Microsoft.XMLHttp");
		}
		catch(e) { 
		}
	}

	if (!xmlHttp)
		return null;
	else 
		return xmlHttp;

// 	var xmlHttp;
// 	xmlHttp = new XMLHttpRequest ();
// 	if (xmlHttp)
// 		return xmlHttp;
// 	else {
// 		var xmlHttpVerze = new Array (
// 			"Microsoft.XMLHttp",
// 			"MSXML2.XMLHTTP.7.0",
// 			"MSXML2.XMLHTTP.6.0",
// 			"MSXML2.XMLHTTP.5.0",
// 			"MSXML2.XMLHTTP.4.0",
// 			"MSXML2.XMLHTTP.3.0",
// 			"MSXML2.XMLHTTP"
// 		);
// 		
// 		for (var i = 0; i < xmlHttpVerze.length; i++) {
// 			xmlHttp = new ActiveXObject (xmlHttpVerze[i]);
// 			if (xmlHttp)
// 				return xmlHttp;
// 		}
// 	}
// 	
// 	return null;
}

var ajaxLoader = function () {
	this.loader = document.createElement ('div');
	this.loader.style.position = 'fixed';
	this.loader.style.top = '50%'; 
	this.loader.style.background = '#888 url(/adminGrafika/ajax-loader.gif) no-repeat center 40px'; 
	this.loader.style.textAlign = 'left'; 
	this.loader.style.width = '300px'; 
	this.loader.style.height = '100px'; 
	this.loader.style.border = '1px solid #000'; 
	this.loader.style.color = '#fff'; 
	this.loader.style.fontWeight = 'bold'; 
	this.loader.style.opacity = '0.80'; 
	this.loader.style.filter = 'alpha(opacity=80)'; 
	this.loader.style._position = 'absolute'; 
	this.loader.style._top = 'expression(0+body.scrollTop);';
	this.loader.style.visibility = 'hidden';
	var objekt = this;
  this.loader.onmouseover = function () {
		if (objekt.loader.style.top == '50%') 
			objekt.loader.style.top = '30%';
		else
			objekt.loader.style.top = '50%';
  }
	document.body.appendChild(this.loader);
  
  this.zobraz = function () {
		//<div id="ajaxLoader" class="ajaxLoader" onmouseover="javascript: ajaxLoader.presun();">{$texty->preloz ('Čekejte...')}</div>
		var scrolledX, scrolledY; 
		if (self.pageYoffset) { 
			scrolledX = self.pageXoffset; 
			scrolledY = self.pageYoffset; 
		} else if (document.documentElement && document.documentElement.scrollTop) { 
			scrolledX = document.documentElement.scrollLeft; 
			scrolledY = document.documentElement.scrollTop; 
		} else if (document.body) { 
			scrolledX = document.body.scrollLeft; 
			scrolledY = document.body.scrollTop; 
		} 
		
		var centerX, centerY; 
		if (self.innerHeight) { 
			centerX = self.innerWidth; 
			centerY = self.innerHeight; 
		} else if (document.documentElement && document.documentElement.clientHeight) { 
			centerX = document.documentElement.clientWidth; 
			centerY = document.documentElement.clientHeight; 
		} else if (document.body) { 
			centerX = document.body.clientWidth; 
			centerY = document.body.clientHeight; 
		} 
		
		var leftoffset = scrolledX + (centerX - this.loader.offsetWidth) / 2; 
		var topoffset = scrolledY + (centerY - this.loader.offsetHeight) / 2; 
		
		//this.loader.style.top = topoffset + 'px'; 
		this.loader.style.left = leftoffset + 'px'; 

		this.loader.style.visibility = 'visible';
  }

  this.skryj = function () {
		this.loader.style.visibility = 'hidden';
//			this.loader.parentNode.removeChild (this.loader);
  }
}