document.getElementsByClassName = function(cl) {
	var retnode = [];
	var myclass = new RegExp('\\b'+cl+'\\b');
	var elem = this.getElementsByTagName('*');
	for (var i = 0; i < elem.length; i++) {
		var classes = elem[i].className;
		if (myclass.test(classes)) retnode.push(elem[i]);
	};
	return retnode;
};
function getNextSibling(node){
	var sibling = node.nextSibling;
	while(sibling.nodeType != 1){
		sibling = sibling.nextSibling;
	};
	return sibling;
};