var runningVar = false;

function autoSlide(){
	document.getElementById('slideImage').style.backgroundImage = "url("+gallery_slide_array[keepTracker]+")";
//	document.getElementById('gallery_name').innerHTML = gallery_name[keepTracker];
	if(gallery_description[keepTracker]){
		document.getElementById('slideImage').title = gallery_description[keepTracker];
	}
	keepTracker++;
	if(keepTracker >=  gallery_slide_array.length){
		keepTracker = 0;
	}
}

function moveSlide(moveVal){
	keepTracker += moveVal;
	if(keepTracker >=  gallery_slide_array.length){
		keepTracker = 0;
	}
	else if(keepTracker < 0){
		keepTracker =  gallery_slide_array.length-1;
	}
	//document.getElementById('slideImage').style.backgroundImage = gallery_slide_array[keepTracker];
	document.getElementById('slideImage').style.backgroundImage = "url("+gallery_slide_array[keepTracker]+")";
//	document.getElementById('gallery_name').innerHTML = gallery_name[keepTracker];
	//document.getElementById('slideImage').title = gallery_description[keepTracker];
	document.getElementById('gal_name').innerHTML = gallery_name[keepTracker];
	document.getElementById('gal_date').innerHTML = gallery_date[keepTracker];
	document.getElementById('gal_description').innerHTML = gallery_description[keepTracker];
}

function randomSlide(){
	keepTracker = Math.floor(Math.random() * gallery_slide_array.length);
	document.getElementById('slideImage').style.backgroundImage = "url("+gallery_slide_array[keepTracker]+")";
	document.getElementById('gal_name').innerHTML = gallery_name[keepTracker];
	document.getElementById('gal_date').innerHTML = gallery_date[keepTracker];
	document.getElementById('gal_description').innerHTML = gallery_description[keepTracker];
	//document.getElementById('slideImage').title = gallery_description[keepTracker];
}

function playBack(action){
	if(!runningVar){
		if(action == 'play'){
			document.getElementById('start').value = 'Pause';
			slidePlay = setInterval('autoSlide()', 3000);
			runningVar = true;
		}
		else if(action == 'ran'){
			slidePlay = setInterval('randomSlide()', 5000);
			runningVar = true;
		}
	}
	else{
		document.getElementById('start').value = 'Start Show';
		clearInterval(slidePlay);
		runningVar = false;
	}
}