var currentIndex = 0;
var gallery = [];

// gallery image array
gallery[0] = '<img src="images/SchHamLivBowlingChairSh.jpg" alt="" />';
gallery[1] = '<img src="images/SchHamLivDet2.jpg" alt="" />';
gallery[2] = '<img src="images/SchKottLivSh.jpg" alt="" />';
gallery[3] = '<img src="images/SchKottPwdSh.jpg" alt="" />';
gallery[4] = '<img src="images/SchLaCrDinAd.jpg" alt="" />';
//gallery[5] = '<img src="images/SFAATHCHOAss2CH-NEW.jpg" alt="" />';
//gallery[x] = '<img src="images/" alt="" />';

// display initial image
var placeholder = document.getElementById("placeholder");
placeholder.innerHTML = gallery[0];

// forward button
document.getElementById("forward").onclick = function() {
	if( currentIndex == gallery.length-1 ){
		currentIndex=0;
		placeholder.innerHTML = gallery[currentIndex];
	}
	else {
		currentIndex=currentIndex+1;
		placeholder.innerHTML = gallery[currentIndex];
	}
	return false;
}

// back button
document.getElementById("back").onclick = function() {
	if( currentIndex == 0 ){
		currentIndex=gallery.length-1;
		placeholder.innerHTML = gallery[currentIndex];
	}
	else {
		currentIndex=currentIndex-1;
		placeholder.innerHTML = gallery[currentIndex];
	}
	return false;
}