var max = 2-1;
var min = 0;
var curr = 0;

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

	return xmlHttp;
}

function showNews(id) {   	   		
    document.getElementById("newsscroller").innerHTML = "Loading";
   	var xmlHttp = GetXmlHttpObject();
    var url = "shownews.php?id=" + id;
    xmlHttp.open("GET",url,true);
    xmlHttp.onreadystatechange=function() {     
        if (xmlHttp.readyState==4) {                     
           document.getElementById("newsscroller").innerHTML = xmlHttp.responseText;		
        }   
    }
    
    if(max == curr) {
    	removeRight();
    	placeLeft();
    } else if(min == curr) {
    	placeRight();
    	removeLeft();
    } else {
    	placeRight();
    	placeLeft();
    }
    
    xmlHttp.send(null);
}

var timer;
var resumeTimer;

function loadFirst() {	
	showNews(curr);
	clearInterval(timer);
	placeRight();
	//timer = setInterval ( "autoScroll()", 10000);	
}


function autoScroll()
{	
	clearInterval ( resumeTimer );	
	if(curr < max) {
		curr = curr + 1;
	} else {
		curr = min;		
	}		
	showNews(curr);
}

function placeLeft()
{
	var elem = document.getElementById("newsleft");
	elem.innerHTML = "<a onClick='goLast();'>Prev</a>";
}

function removeLeft()
{
	var elem = document.getElementById("newsleft");
	elem.innerHTML = "";
}

function placeRight()
{
	
	var elem = document.getElementById("newsright");
	elem.innerHTML = "<a onClick='goLast();'>Next</a>";
}

function removeRight()
{
	var elem = document.getElementById("newsright");
	elem.innerHTML = "";
}

function goNext() 
{	
	clearInterval ( timer );
	clearInterval(resumeTimer);
	resumeTimer = setInterval("loadFirst()", 15000);
	
	if((curr + 1) <= max) {
		curr = curr + 1;
	} else {
		curr = min;
	}		

	showNews(curr);

}

function goLast()
{		
	clearInterval ( timer );
	clearInterval(resumeTimer);

	if((curr - 1) >= min) {
		curr = curr - 1;
	} else {
		curr = max;
				 
	}
		
	showNews(curr);    	
}