/* Javascript Functions */

var logos = 10;
var ci = 5;
var fly = 9;
var menus = 4;
var posters = 4;
var ban = 3;
var ad = 5;
var currentItem = 1;

function nextImage( id ) {

	var length = eval(id);

	currentItem++;

	if ( currentItem == 2 ) document.getElementById('back').style.visibility="visible";   /* Turn on back button */
 
	if ( currentItem == length ) { 
		document.getElementById('next').style.visibility="hidden";
	}
	
	var image = document.getElementById(id);
	image.src = '/images/portfolio/'+id+''+currentItem+'.jpg';	
	document.getElementById('pagenum').innerHTML = currentItem;
}

function prevImage( id ) {

	var length = eval(id);

	currentItem--;

	if ( currentItem < length ) document.getElementById('next').style.visibility="visible";  /* Turn on next button */

	if ( currentItem == 1 ) { 
		document.getElementById('back').style.visibility="hidden";
	}

	var image = document.getElementById(id);
	image.src = '/images/portfolio/'+id+''+currentItem+'.jpg';
	document.getElementById('pagenum').innerHTML = currentItem;
}