var xmlHttp;
var TargetDiv;
var afterExec='';
var response;

function ajaxForm(action, method, frm, div){
	var postData = '';
	var keyvalue;
	var fieldname;
	for (var i=0; i < frm.elements.length; i++){
		fieldname = frm.elements[i].name;
		keyvalue='';
		if (frm.elements[i].type!='checkbox'){
			keyvalue = fieldname + '=' + encodeURI(frm.elements[i].value);
		} else {
			if (frm.elements[i].checked){
				keyvalue = fieldname + '=' + encodeURI(frm.elements[i].value);
			}
		}
		if (keyvalue.length>0){
			if (postData==''){postData=keyvalue;}else{postData+='&'+keyvalue;}
		}
	}
	SendRequest(action,method,postData,div);
}

function afterPostAction(){
	if (afterExec.length>0){
		eval(afterExec);
	}
}

function SendRequest(URL,Method,Data, div)
{	
	TargetDiv = div;
	document.getElementById(TargetDiv).innerHTML='<p align=center><img src="/images/ajax-loader.gif" width="16" height="16"></p>';
	
	if (URL.length==0){ 
	  //document.getElementById("SiteContent").innerHTML="";
	  return;
	}
	xmlHttp=GetXmlHttpObject()
	if (xmlHttp==null){
	  alert ("Your browser does not support AJAX!");
	  return;
	} 
	if (URL.indexOf('?')==-1){
		URL=URL+"?sid="+Math.random();
	} else {
		URL=URL+"&sid="+Math.random();
	}
	//alert(URL);
	xmlHttp.onreadystatechange=stateChanged;
	xmlHttp.open(Method,URL,true);
	if (Method=='POST'){
      xmlHttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
      xmlHttp.setRequestHeader("Content-length", Data.length);
      xmlHttp.setRequestHeader("Connection", "close");
	}
	xmlHttp.send(Data);
}

function stateChanged() 
{ 
	var i=xmlHttp.readyState;
	if (xmlHttp.readyState==4){ 
		response = xmlHttp.responseText;
		document.getElementById(TargetDiv).innerHTML=response;
		afterPostAction();
	}
}

function GetXmlHttpObject(){
  var xmlHttp=null;
  try{
    // Firefox, Opera 8.0+, Safari
    xmlHttp=new XMLHttpRequest();
    }
  catch (e){
    // Internet Explorer
    try{
      xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
      }
    catch (e){
      xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
      }
    }
  return xmlHttp;
}

function URLEncode( plaintext )
{
	// The Javascript escape and unescape functions do not correspond
	// with what browsers actually do...
	var SAFECHARS = "0123456789" +					// Numeric
					"ABCDEFGHIJKLMNOPQRSTUVWXYZ" +	// Alphabetic
					"abcdefghijklmnopqrstuvwxyz" +
					"-_.!~*'()";					// RFC2396 Mark characters
	var HEX = "0123456789ABCDEF";

	var encoded = "";
	for (var i = 0; i < plaintext.length; i++ ) {
		var ch = plaintext.charAt(i);
	    if (ch == " ") {
		    encoded += "+";				// x-www-urlencoded, rather than %20
		} else if (SAFECHARS.indexOf(ch) != -1) {
		    encoded += ch;
		} else {
		    var charCode = ch.charCodeAt(0);
			if (charCode > 255) {
			    alert( "Unicode Character '" 
                        + ch 
                        + "' cannot be encoded using standard URL encoding.\n" +
				          "(URL encoding only supports 8-bit characters.)\n" +
						  "A space (+) will be substituted." );
				encoded += "+";
			} else {
				encoded += "%";
				encoded += HEX.charAt((charCode >> 4) & 0xF);
				encoded += HEX.charAt(charCode & 0xF);
			}
		}
	} // for

	return encoded;
}