var nextImg = 0;
var prevImg = 0;

function nextPhoto(totImgs){

	var imgC = document.getElementById('spashImg');
	var preBtn = document.getElementById('prevBtn');
	var nextBtn = document.getElementById('nextBtn');
	if(totImgs > nextImg){
		nextImg++;
		prevImg = nextImg - 1;
		imgC.src = imgObj[nextImg].src;
		if(totImgs == nextImg){
			nextBtn.style.visibility = 'hidden';
			preBtn.style.visibility = 'visible';
		}
		if(nextImg>0){
			preBtn.style.visibility = 'visible';
		}
	}
}

function prevPhoto(totImgs){
	var imgC = document.getElementById('spashImg');
	var preBtn = document.getElementById('prevBtn');
	var nextBtn = document.getElementById('nextBtn');
	if(totImgs > prevImg){
		nextImg--;
		prevImg = nextImg - 1;
		if(prevImg < 0){
			preBtn.style.visibility = 'hidden';
			prevImg = 0;	
		}				
		imgC.src = imgObj[prevImg].src;
		if(totImgs == prevImg){
			nextBtn.style.visibility = 'visible';
			preBtn.style.visibility = 'hidden';
		}
		if(nextImg>0){
			nextBtn.style.visibility = 'visible';
		}		
	}
}