function Ajax() {
  this.req = null;
  this.url = null;
  this.status = null;
  this.statusText = '';
  this.method = 'GET';
  this.async = true;
  this.dataPayload = null;
  this.readyState = null;
  this.responseText = null;
  this.responseXML = null;
  this.handleResp = null;
  this.responseFormat = 'xml', // 'text', 'xml', 'object'
  this.mimeType = null;
  this.headers = [];

  
  this.init = function() {
    var i = 0;
    var reqTry = [ 
      function() { return new XMLHttpRequest(); },
      function() { return new ActiveXObject('Msxml2.XMLHTTP') },
      function() { return new ActiveXObject('Microsoft.XMLHTTP' )} ];
      
    while (!this.req && (i < reqTry.length)) {
      try { 
        this.req = reqTry[i++]();
      } 
      catch(e) {}
    }
    return true;
  };
  this.doGet = function(url, hand, format) {
    this.url = url;
    this.handleResp = hand;
    this.responseFormat = format || 'text';
    this.doReq();
  };
  this.doPost = function(url, dataPayload, hand, format) {
    this.url = url;
    this.dataPayload = dataPayload;
    this.handleResp = hand;
    this.responseFormat = format || 'text';
    this.method = 'POST';
    this.doReq();
  };
  this.doReq = function() {
    var self = null;
    var req = null;
    var headArr = [];
    
    if (!this.init()) {
      alert('Could not create XMLHttpRequest object.');
      return;
    }
    req = this.req;
    req.open(this.method, this.url, this.async);
    if (this.method == "POST") {
      this.req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    }
    if (this.method == 'POST') {
      req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    }
    self = this;
    req.onreadystatechange = function() {
      var resp = null;
      self.readyState = req.readyState;
      if (req.readyState == 4) {
        
        self.status = req.status;
        self.statusText = req.statusText;
        self.responseText = req.responseText;
        self.responseXML = req.responseXML;
        
        switch(self.responseFormat) {
          case 'text':
            resp = self.responseText;
            break;
          case 'xml':
            resp = self.responseXML;
            break;
          case 'object':
            resp = req;
            break;
        }
        
        if (self.status > 199 && self.status < 300) {
          if (!self.handleResp) {
            alert('No response handler defined ' +
              'for this XMLHttpRequest object.');
            return;
          }
          else {
            self.handleResp(resp);
          }
        }
        
        else {
          self.handleErr(resp);
        }
      }
    }
    req.send(this.dataPayload);
  };
  this.abort = function() {
    if (this.req) {
      this.req.onreadystatechange = function() { };
      this.req.abort();
      this.req = null;
    }
  };
  this.handleErr = function() {
    var errorWin;
    // Create new window and display error
    try {
      errorWin = window.open('', 'errorWin');
      errorWin.document.body.innerHTML = this.responseText;
    }
    // If pop-up gets blocked, inform user
    catch(e) {
      alert('An error occurred, but the error message cannot be' +
      ' displayed because of your browser\'s pop-up blocker.\n' +
      'Please allow pop-ups from this Web site.');
    }
  };
  this.setMimeType = function(mimeType) {
    this.mimeType = mimeType;
  };
  this.setHandlerResp = function(funcRef) {
    this.handleResp = funcRef;
  };
  this.setHandlerErr = function(funcRef) {
    this.handleErr = funcRef; 
  };
  this.setHandlerBoth = function(funcRef) {
    this.handleResp = funcRef;
    this.handleErr = funcRef;
  };
  this.setRequestHeader = function(headerName, headerValue) {
    this.headers.push(headerName + ': ' + headerValue);
  };
  
}
function initpage(){
	loadinvoices();
	loadquotes();
	loadjobs();
	getjob(0);
}

function getjob(ID){
		  //commit changes to the database and return status code.
		  strhand = function(str) {
				document.getElementById('jobdetail').innerHTML=str;  
		  }
		  var PostData = "ID="+ID;
		  var strajax = new Ajax();
		  strajax.setMimeType('text/text');
		  strajax.doPost('scripts/jobdetails.php',PostData, strhand, 'text');
}

function loadjobs(){
		  //commit changes to the database and return status code.
		  strhand = function(str) {
				document.getElementById('joblist').innerHTML=str;  
		  }
		  var PostData = "";
		  var strajax = new Ajax();
		  strajax.setMimeType('text/text');
		  strajax.doPost('scripts/loadjobs.php',PostData, strhand, 'text');
}

function loadquotes(){
		  //commit changes to the database and return status code.
		  strhand = function(str) {
				document.getElementById('quotelist').innerHTML=str;  
		  }
		  var PostData = "";
		  var strajax = new Ajax();
		  strajax.setMimeType('text/text');
		  strajax.doPost('scripts/loadquotes.php',PostData, strhand, 'text');
}
function loadinvoices(){
		  //commit changes to the database and return status code.
		  strhand = function(str) {
				document.getElementById('invoicelist').innerHTML=str;  
		  }
		  var PostData = "";
		  var strajax = new Ajax();
		  strajax.setMimeType('text/text');
		  strajax.doPost('scripts/loadinvoices.php',PostData, strhand, 'text');
}
function sendenquiry(obj){
		  //commit changes to the database and return status code.
		  strhand = function(str) {
				document.getElementById('response').innerHTML=str;  
		  }
		  		var PostData = "area="+obj.elements['area'].value+"&company="+obj.elements['company'].value+"&contactname="+obj.elements['contactname'].value+"&phone="+obj.elements['phone'].value+"&email="+obj.elements['email'].value+"&message="+obj.elements['message'].value
		  var strajax = new Ajax();
		  strajax.setMimeType('text/text');
		  strajax.doPost('scripts/sendenquiry.php',PostData, strhand, 'text');
}
function getinvoicedata(ID){
		  //commit changes to the database and return status code.
		  strhand = function(str) {
				document.getElementById('jobresponse').innerHTML=str;  
		  }
		  var PostData = "ID="+ID;
		  var strajax = new Ajax();
		  strajax.setMimeType('text/text');
		  strajax.doPost('scripts/jobdetails.php',PostData, strhand, 'text');
}
function login(obj){
		  //commit changes to the database and return status code.
		  strhand = function(str) {
			  alert ("w"+str);
				if (str == "Incorrect Username or Password"){
					//document.getElementById('result').innerHTML=str;
				} else {
					alert("Reditecting");
					//window.location = str;
				}
		  }
		  var PostData = "username="+obj.elements['username'].value+"&password="+obj.elements['password'].value;
		  var strajax = new Ajax();
		  strajax.setMimeType('text/text');
		  strajax.doPost('scripts/login.php',PostData, strhand, 'text');
}