function big_image(identity) {
	
	var divs = document.getElementsByTagName('div');

	for(var i = 0; i < divs.length; i++) {
		if(divs.item(i).className == 'bigimage') {
			divs.item(i).style.display = 'none';
		}
	}

	document.getElementById(identity).style.display = 'block';
}

function close_big(identity) {
	var divs = document.getElementsByTagName('div');

	for(var i = 0; i < divs.length; i++) {
		if(divs.item(i).className == 'bigimage') {
			divs.item(i).style.display = 'none';
		}
	}
}