var xmlHttp = new Array(); // use array for simultaneous calls

function GetXmlHttpObject() {
	try { return new XMLHttpRequest(); }
	catch (e) {
		try { 
			return new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			return new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	return null;
}

function loadAjax(divId, url, someFunction, someParams) {
	var divObj = document.getElementById(divId);
	if(divObj) {
		var reqId = xmlHttp.length;
		xmlHttp[reqId] = GetXmlHttpObject();
		if (xmlHttp[reqId] == null) {
			alert ("Your browser does not support AJAX!");
			return;
		}
		xmlHttp[reqId].onreadystatechange = function() { loadedAjax(reqId, someFunction, someParams, divObj); };  
		xmlHttp[reqId].open("GET", url, true);
		xmlHttp[reqId].setRequestHeader('Content-Type', 'application/ajax+html');
		xmlHttp[reqId].send(null);
	} else {
		alert("Can't initiliaze HTML object: " + divId);
	}
	return false;
}

function callAjax(url, someFunction, someParams) {
	if (someFunction) {
		var reqId = xmlHttp.length;
		xmlHttp[reqId] = GetXmlHttpObject();
		if (xmlHttp[reqId] == null) {
			alert ("Your browser does not support AJAX!");
			return;
		}

		xmlHttp[reqId].onreadystatechange = function() { loadedAjax(reqId, someFunction, someParams, ""); };  
		xmlHttp[reqId].open("GET", url, true);
		xmlHttp[reqId].setRequestHeader('Content-Type', 'application/ajax+html');
		xmlHttp[reqId].send(null);
	} else {
		alert("Function is not defined for AJAX call.");
	}
	return false;
}

function postAjax(url, someFunction, someParams, formObject) {
	var params = "";
	if (formObject) {
		for (var f = 0; f < formObject.elements.length; f++) {
			var formElement = formObject.elements[f];
			var elementType = formElement.type;
			var elementName = formElement.name;
			var elementValue = "";
			if (elementType == "radio" || elementType == "checkbox") {
				if (formElement.checked) {
					elementValue = formElement.value;
				}
			} else {
				elementValue = formElement.value;
			}
			if (elementValue && elementValue != "") {
				if (params != "") { params += "&"; }
				params += elementName+"="+encodeURIComponent(elementValue);
			}
		}
	}
	if (someFunction) {
		var reqId = xmlHttp.length;
		xmlHttp[reqId] = GetXmlHttpObject();
		if (xmlHttp[reqId] == null) {
			alert ("Your browser does not support AJAX!");
			return;
		}

		xmlHttp[reqId].onreadystatechange = function() { loadedAjax(reqId, someFunction, someParams, ""); };  
    xmlHttp[reqId].open('POST', url, true);
    xmlHttp[reqId].setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    xmlHttp[reqId].setRequestHeader("Content-length", params.length);
    xmlHttp[reqId].setRequestHeader("Connection", "close");
    xmlHttp[reqId].send(params);

	} else {
			alert("Function is not defined for AJAX call.");
	}
	return false;
}


function loadedAjax(reqId, someFunction, someParams, divObj) 
{
	if (xmlHttp[reqId].readyState == 4) {
		if (divObj) {
			divObj.innerHTML = xmlHttp[reqId].responseText;
		}
		if (someFunction) {
			someFunction(xmlHttp[reqId].responseText, someParams);
		}
		xmlHttp[reqId] = null;
	}
}

function nextNode(e) {
	return ((e && e.nodeType != 1) ? nextNode(e = e.nextSibling) : e);
}

function prevNode(e) {
	return ((e && e.nodeType != 1) ? prevNode(e = e.previousSibling) : e);
}

function nextElement(e) {
	return nextNode(e.nextSibling);
}

function prevElement(e) {
	return prevNode(e.previousSibling);
}



function addClassNameByID(obj_id, classname) {
	var obj    = document.getElementById(obj_id);
	if (obj) {
		addClassName(obj, classname);	
	}
	var obj    = document.getElementsByName(obj_id);
	if (obj) {
		for(var j=0; j<obj.length; j++) {
			addClassName(obj[j], classname);
		}
	}	
}

function addClassName(obj, classname) {
	obj.className += " " + classname;	
}

function removeClassNameByID(obj_id, classname) {
	var obj    = document.getElementById(obj_id);
	if (obj) {
		removeClassName(obj, classname);
	}
	var obj    = document.getElementsByName(obj_id);
	if (obj) {
		for(var j=0; j<obj.length; j++) {
			removeClassName(obj[j], classname);
		}
	}
}

function removeClassName(obj, classname) {
	var substr = obj.className.split(" ");
	if (substr.length) {
		obj.className = "";
		for (i = 0; i < substr.length; i++) {
			if (substr[i] !== classname) {
				obj.className += " " + substr[i];
			}
		}
	} else if (obj.className == classname){
		obj.className = "";
	}
}

function hasClassNameByID(obj_id, classname) {
	var obj    = document.getElementById(obj_id);
	if (obj) {
		return hasClassName(obj, classname);
	}
	var obj    = document.getElementsByName(obj_id);
	if (obj) {
		if (obj.length) {
			return hasClassName(obj[0], classname);
		} else {
			return hasClassName(obj, classname);
		}
	}
	return false;
}

function hasClassName(obj, classname) {
	var substr = obj.className.split(" ");
	if (substr.length) {
		for (i = 0; i < substr.length; i++) {
			if (substr[i] == classname) {
				return true;
			}
		}
	} else if (obj.className == classname){
		return true;
	}
	return false;
}

function formSerialize(form) {
	var serialized = "";
	for (i = 0; i<form.length; i++) {
		if(form[i].type) {
			if (form[i].type == "text" || form[i].type == "hidden" || form[i].type == "select-one") {
				serialized += form[i].name + "=" + form[i].value + "&";
			} else if (form[i].type == "checkbox") {
				if (form[i].checked) {
					serialized += form[i].name + "=" + form[i].value + "&";
				}
			}
		} else {
			serialized += form[i].name + "=" + form[i].value + "&";
		}
	}
	return serialized;	
}

function stringUnserialize(str) {
	var substr = str.split("&");
	var values = new Array();
	var j = 0;
	if (substr.length) {
		for (i = 0; i < substr.length; i++) {
			if (substr[i].length) {
				line = substr[i].split("=");
				if (line.length && line[0]){
					values[j] = new Array();
					values[j][0] = line[0];
					values[j][1] = line[1];
					j++;
				}
			}
		}
	} else {
		line = response.split("=");
		if (line.length && line[0]){
			values[j] = new Array();
			values[j][0] = line[0];
			values[j][1] = line[1];
			j++;
		}
	}
	return values;
}