function e(id){
	
	return document.getElementById(id);
	
}

// multi-browser XMLHttpRequest function
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)
    {
    try
      {
      xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
      }
    catch (e)
      {
      alert("Sorry, your browser does not support AJAX");
      return false;
      }
    }
  }
return xmlHttp;
}



function confirmDelete(course_id)
{
	
	document.write("<p>Height: ")
	document.write(screen.height + "</p>")
	
}


function addCourse()
{
	
	xmlHttp=getXmlHttpObject();
	
	var url="add.php";
	
	xmlHttp.open("GET",url,true);
	
	xmlHttp.onreadystatechange=displayResults;

	xmlHttp.send(null);

}


function editCourse(id)
{
	
	xmlHttp=getXmlHttpObject();
	
	var url="edit.php?id="+id;
	
	xmlHttp.open("GET",url,true);
	
	xmlHttp.onreadystatechange=displayResults;

	xmlHttp.send(null);

}


function deleteCourse(type,course_id)
{
	
	var params = "type="+type+"&course_id="+course_id;
	
	xmlHttp=getXmlHttpObject();
	
	var url="update.php?"+params;
	
	xmlHttp.open("GET",url,true);
	
	xmlHttp.onreadystatechange=displayResults;

	xmlHttp.send(null);

}


function updateDB(type,course_id)
{
	
	//e('loaderbar').style.display = "block";
	
	var form = e('courseform');
	
	var params = "type="+type+"&course_id="+course_id+"&";
	
	//for each form element add name and value to params variable
	for (var n=0; n < form.elements.length; n++) {
		if(form.elements[n].type != "checkbox"){
			params = params + form.elements[n].name + "=" + form.elements[n].value.replace(/&/g, "and") + "&";
		}else if(form.elements[n].type == "checkbox" && form.elements[n].checked){
			params = params + form.elements[n].name + "=" + form.elements[n].value + "&";
		}
	}
	
	xmlHttp=getXmlHttpObject();
	
	var url="update.php?"+params;
	
	xmlHttp.open("GET",url,true);
	
	xmlHttp.onreadystatechange=displayResults;

	xmlHttp.send(null);

}


function addDB()
{
	
	//e('loaderbar').style.display = "block";
	
	var form = e('courseform');
	
	var params = "type=1&";
	
	//for each form element add name and value to params variable
	for (var n=0; n < form.elements.length; n++) {
		if(form.elements[n].type != "checkbox"){
			params = params + form.elements[n].name + "=" + form.elements[n].value.replace(/&/g, "and") + "&";
		}else if(form.elements[n].type == "checkbox" && form.elements[n].checked){
			params = params + form.elements[n].name + "=" + form.elements[n].value + "&";
		}
	}
	
	xmlHttp=getXmlHttpObject();
	
	var url="update.php?"+params;
	
	xmlHttp.open("GET",url,true);
	
	xmlHttp.onreadystatechange=displayResults;

	xmlHttp.send(null);

}


//return XMLHttpRequest value to innerHTML of id
function displayResults(id)
{ 
	if (xmlHttp.readyState==4)
	{ 
	e('contact-form').innerHTML=xmlHttp.responseText;
	}
}