function nextOpenNode() {
	var mainId=document.getElementById("main");
	var tagP=mainId.getElementsByTagName("p");
	for(var i=0;i<tagP.length;i++) {
		tagP[i].onclick = function(){
			var tableTag = getNextElement(this.nextSibling);
			var idName=tableTag.getAttribute("class")||tableTag.getAttribute("className");
			if (idName != "defaultTag") {
				tableTag.setAttribute("class", "defaultTag")||tableTag.setAttribute("className", "defaultTag");
			}
			if(idName=="defaultTag") {
				tableTag.setAttribute("class", "clickTag")||tableTag.setAttribute("className", "clickTag");
			}
		}
	}
}

function defaultNode() {
	var mainId=document.getElementById("main");
	var tagP=mainId.getElementsByTagName("p");
	for(var i=0;i<tagP.length;i++) {
		tagP[i].className="overMouse";
		var tableTag=getNextElement(tagP[i].nextSibling);
		tableTag.setAttribute("class","defaultTag")||tableTag.setAttribute("className","defaultTag");
	}
}


function getNextElement(node) {
	if(node.nodeType==1) {
		return node;
	}
	if(node.nextSibling) {
		return getNextElement(node.nextSibling);
	}
	return null;
}


addLoadEvent(defaultNode);
addLoadEvent(nextOpenNode);