function Category(id) {
	document.getElementById('kotly-co').className = 'hidden';
	document.getElementById('ogrzewacze').className = 'hidden';
	document.getElementById('wymienniki').className = 'hidden';
	document.getElementById('kolektory').className = 'hidden';
	
	document.getElementById(id).className = '';
	document.getElementById('products').className = id;
}

function FilesOpen() {
	var button = document.getElementById('filesButton');
	var list = document.getElementById('files');
	
	list.style.display = 'block';
	
	var top = 0;
	var left = button.offsetWidth - list.offsetWidth;
	var parent = button;
	while(parent && parent.className != 'content') {
		top += parent.offsetTop;
		left += parent.offsetLeft;
		parent = parent.offsetParent;
	}
	
	list.style.top = top + 'px';
	list.style.left = left + 'px';
}

function FilesClose() {
	document.getElementById('files').style.display = 'none';
}