var http_request = false;
var direction;
function makePOSTRequest(url, parameters) {
	var dir = direction;
	http_request = false;
  if (window.XMLHttpRequest) { 
	 http_request = new XMLHttpRequest();
	 if (http_request.overrideMimeType) {
	
		http_request.overrideMimeType('text/html');
	 }
  } else if (window.ActiveXObject) { // IE
	 try {
		http_request = new ActiveXObject("Msxml2.XMLHTTP");
	 } catch (e) {
		try {
		   http_request = new ActiveXObject("Microsoft.XMLHTTP");
		} catch (e) {}
	 }
  }
  if (!http_request) {
	 alert('Cannot create XMLHTTP instance');
	 return false;
  }
  
  http_request.onreadystatechange = alertContents;
  http_request.open('POST', url, true);
  http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
  http_request.setRequestHeader("Content-length", parameters.length);
  http_request.setRequestHeader("Connection", "close");
  http_request.send(parameters);
}

function alertContents() 
{
  if (http_request.readyState == 4) 
  {
	 if (http_request.status == 200) 
	 {
		
		var result = http_request.responseText;
	
		document.getElementById('innercontent').innerHTML = result;
		
		if(window.direction == "right")
		{
			document.getElementById('current').value = parseInt(document.getElementById('current').value)+1;
			
		}
		else if(window.direction == "left")
		{
			document.getElementById('current').value = parseInt(document.getElementById('current').value)-1;
			
		}
		
		if(parseInt(document.getElementById('current').value) > 0)
		{
			document.getElementById('nav_left').style.display = 'block';
			
		}
		else
		{
		document.getElementById('nav_left').style.display = 'none';
		
		}
		
		if( parseInt(document.getElementById('current').value) >= parseInt(document.getElementById('total').value)-1 )
		{
			document.getElementById('nav_right').style.display = 'none';
		}
		else
		{
			document.getElementById('nav_right').style.display = 'block';
		}
		

		        
	 } 
	 else 
	 {
		alert('There was a problem with the request.');
	 }
  }
}
function get(dir) {
	direction = dir;
  var poststr= "page=" + encodeURI( document.getElementById('current').value ) +
  "&direction=" + encodeURI( direction );
  makePOSTRequest('out.php', poststr);
 
}