var grey_box = document.getElementById('greybox_box');
var greybox_content = document.getElementById('greybox_content');
function open_greybox(content) {
	greybox_content.innerHTML = content;
	grey_box.style.display = 'block';
}

function close_greybox() {
	greybox_content.innerHTML = '';
	grey_box.style.display = 'none';
}