// JScript Doc

var imgcnt;
var tracker=1;

function getImagecount(){
var arr = document.getElementById('div1').getElementsByTagName('img');

imgcnt=arr.length;
}


function previous(){
	
	document.getElementById("next").innerHTML='<a href="javascript:next()"><img src="../img/next.gif"></a> ';
	
	if(tracker!=1){
		document.getElementById("next").style.display="block";
		document.getElementById(tracker.toString()).style.display="none";
		tracker=tracker-1;
		document.getElementById(tracker.toString()).style.display="block";
		if(tracker==1){
				document.getElementById("pre").innerHTML='<img src="../img/prev.gif">';
				document.getElementById("pre").style.display="none";
			}
			else{
				document.getElementById("pre").innerHTML='<a href="javascript:previous()"><img src="../img//prev.gif"></a> ';
				}
		}
}

function next(){
	
	var arr = document.getElementById('div1').getElementsByTagName('img');

    imgcnt=arr.length;
	
	document.getElementById("pre").innerHTML='<a href="javascript:previous()"><img src="../img/prev.gif"></a> ';
	document.getElementById("pre").style.display="block";
	if(tracker!=imgcnt){
		
		document.getElementById(tracker).style.display="none";
		tracker=tracker+1;
		
		document.getElementById(tracker).style.display="block";
		if(tracker==imgcnt){
			//disable next
			document.getElementById("next").innerHTML='<img src="../img/next.gif">';
			document.getElementById("next").style.display="none";
			}
			else{
					document.getElementById("next").innerHTML='<a href="javascript:next()"><img src="../img/next.gif"></a> ';
				
				}
		}
}