function getXMLHttpRequest() 
	{
  		if (window.XMLHttpRequest) {
      	return new window.XMLHttpRequest;
    	}
    	else {
      	try {
         	return new ActiveXObject("MSXML2.XMLHTTP.3.0");
        	}
      	catch(ex) {
            return null;
        	}
    	}
	}
	
	function showDistricts() {
		var cities = "";
		var citySelect = document.getElementById('cityselector');
		for(var k = 0 ; k < citySelect.options.length ; k++ ) {
			if(citySelect.options[k].selected) {
				cities = cities + citySelect.options[k].value + ",";
			}
		}
	
		var xmlhttp = getXMLHttpRequest();
		
		if(xmlhttp == null) {
			alert("Your browser's settings prevent functionality");
			return;
		}
	
		var distItems = document.getElementById('districtselector');
		
		xmlhttp.onreadystatechange = function () {
			if(xmlhttp.readyState == 4 && xmlhttp.status == 200) {
				distItems.options.length = 0;
				if(xmlhttp.responseText.length > 2) {
					districtList = JSON.parse(xmlhttp.responseText);
					for(i in districtList) {
						distItems.options[distItems.options.length] = new Option(districtList[i], i);
					}
				}
			}
		};
		xmlhttp.open("GET", "ajaxcalls.php?function=getDistricts&cityId="+cities, true);
		xmlhttp.send(null);
	}
	
	function search() {
	
		var xmlhttp = getXMLHttpRequest();

		if(xmlhttp == null) {
			alert("Your browser's settings prevent functionality");
			return;
		}
		
		var url = "ajaxcalls.php?function=filterRentables&";

		var cities = "cityId=";
		var citySelect = document.getElementById('cityselector');
		for(var k = 0 ; k < citySelect.options.length ; k++ ) {
			if(citySelect.options[k].selected && citySelect.options[k].value != "") {
				cities = cities + citySelect.options[k].value + ",";
			}
		}
		
		url = url + cities;		
		
		var districts = "&districtId=";
		var districtSelect = document.getElementById('districtselector');
		for(var k = 0 ; k < districtSelect.options.length ; k++ ) {
			if(districtSelect.options[k].selected && districtSelect.options[k].value != "") {
				districts = districts + districtSelect.options[k].value + ",";
			}
		}
		
		url = url + districts;


		var types = "&typeId=";
		var typeSelect = document.getElementById('typeselector');
		for(var k = 0 ; k < typeSelect.options.length ; k++ ) {
			if(typeSelect.options[k].selected && typeSelect.options[k].value != "") {
				types = types + typeSelect.options[k].value + ",";
			}
		}
		
		url = url + types;

		url = url + "&flatsize_from=" + document.getElementById('flatsize_from').value;
		url = url + "&flatsize_to=" + document.getElementById('flatsize_to').value;
		
		url = url + "&date_from=" + document.getElementById('date_from').value;
		url = url + "&date_until=" + document.getElementById('date_until').value;
		url = url + "&price_from=" + document.getElementById('price_from').value;
		url = url + "&price_to=" + document.getElementById('price_to').value;
		url = url + "&rooms_from=" + document.getElementById('rooms_from').value;
		url = url + "&rooms_to=" + document.getElementById('rooms_to').value;

		var tbl = document.getElementById('searchresults');
		xmlhttp.onreadystatechange = function () {
			if(xmlhttp.readyState == 4 && xmlhttp.status == 200) {
				tbl.innerHTML = xmlhttp.responseText;
				document.getElementById("searchresults").style.visibility = "visible";
			}
		};
		//alert(url);
		xmlhttp.open("GET", url, true);
		xmlhttp.send(null);
	}