function slide_left(){
	var active=document.getElementById('active_img').value;
	active=parseInt(active);
	var img_count=document.getElementById('img_count').value;
	img_count=parseInt(img_count);
	var slide_to;
	if(active-1<0) slide_to=img_count; else slide_to=active-1;
	slide(slide_to);
}

function slide_right(){
	var active=document.getElementById('active_img').value;
	active=parseInt(active);
	var img_count=document.getElementById('img_count').value;
	img_count=parseInt(img_count);
	var slide_to;
	if(active+1>img_count) slide_to=0; else slide_to=active+1;
	slide(slide_to);
}

function slide(index){
	var nav_button = jQuery('#nav'+index);
	nav_button.trigger("click");
	document.getElementById('pic_desc').innerHTML =	document.getElementById('desc'+index).value;
}

function deactivate_nav_buttons(){
	if(document.getElementById('img_count').value>2){
		document.getElementById('gal_nav_left').style.display='none';
		document.getElementById('gal_nav_right').style.display='none';
	}
}