var xml_http = createxmlhttprequest();

function createxmlhttprequest() {
	
	var xml_http;
	
	try {
		xml_http = new XMLHttpRequest();
	}
	catch(e) {
		var xmlhttpversions = new Array(
										"MSXML2.XMLHTTP.6.0",
										"MSXML2.XMLHTTP.5.0",
										"MSXML2.XMLHTTP.4.0",
										"MSXML2.XMLHTTP.3.0",
										"MSXML2.XMLHTTP",
										"Microsoft.XMLHTTP"
										);
										
			for(var i=0;i<xmlhttpversions.length && !xml_http; i++) {
				
				try {
					xml_http = new ActiveXObject(xmlhttpversions[i]);
				}
				catch(e) {}
				
			}
	}
	
	if(!xml_http) {
		alert("Nemozem vytvorit XMLHttpRequest.");
	}
	else {
		return xml_http;
	}
	
}

function zobraz(cislo) {
	
	if(xml_http) {
		
		try {

			var cis = cislo;

			xml_http.open("GET", "ajax_fotogaleria.php?&cislo="+cis, true);
			xml_http.onreadystatechange = handlerequeststatechange;
			xml_http.send(null);
			
		}
		catch(e) {
			alert("Nemozem otvorit subor.");
		}
		
	}
	
}

function handlerequeststatechange() {

	if(xml_http.readyState == 4) {
		
		if(xml_http.status == 200) {
			
			try {
				
				vrat_obr();
				
			}
			catch(e) {
				
				alert("Nemozem sa pripojit na server.");
				
			}
			
		}
		
	}
	
}

function vrat_obr() {

	var responseText = xml_http.responseText;

	mojdiv = document.getElementById("content_right");
	mojdiv.innerHTML = responseText;
	
}