function createXmlHttpObject()
{
	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 getFeatures(page)
{
	if ((page < 1) || (page > maxFeaturePage))
		return void(0);
	currentPage = page;
	var xhr = createXmlHttpObject();
	
	if (xhr != null)
	{
		xhr.onreadystatechange=function()
	    	{
    		if(xhr.readyState==4)
      			{
      			document.getElementById("bookFeatures").innerHTML = xhr.responseText;
      			}
    		}
		  	xhr.open("GET", "ajax/features.php?page="+page, true);
		  	xhr.send(null);
 	}
}

function getPages(page)
{
	if ((page < 1) || (page > maxFeaturePage))
		return void(0);
	currentPage = page;
	var xhr = createXmlHttpObject();
	
	if (xhr != null)
	{
		xhr.onreadystatechange=function()
	    	{
    		if(xhr.readyState==4)
      			{
      			document.getElementById("headerPages").innerHTML = xhr.responseText;
      			}
    		}
		  	xhr.open("GET", "ajax/pages.php?page="+page, true);
		  	xhr.send(null);
 	}	
}