function openBL(img,num){
	document.getElementById('box-darkened').style.display='block';
	document.getElementById('box-light').style.display='block';
	document.getElementById('imgid'+img).style.display='block';
	//document.getElementById('body').style.overflow='hidden';
	document.getElementsByTagName('html')[0].style.overflow='hidden';
	window.scrollTo(0,0);
}

function closeBL(num){
	document.getElementById('box-darkened').style.display='none';
	document.getElementById('box-light').style.display='none';
	for (var i = 0; i<num; i++){
		document.getElementById('imgid'+i).style.display='none';
	}
	//document.getElementById('body').style.overflow='auto';
	document.getElementsByTagName('html')[0].style.overflow='auto';
}

function backBL(img,num){
	for (var i = 0; i<num; i++){
		if (i==img){
			document.getElementById('imgid'+i).style.display='block';
		}else{
			document.getElementById('imgid'+i).style.display='none';
		}
	}
}
function nextBL(img,num){
	for (var i = 0; i<num; i++){
		if (i==img){
			document.getElementById('imgid'+i).style.display='block';
		}else{
			document.getElementById('imgid'+i).style.display='none';
		}
	}
}