// JavaScript Document
function switchTab(o,n,t){
var num = o.parentNode.children.length;
	//var num1 = o.parentNode.childNodes.length;
	//alert(num1 +"  "+num);
	var nId = document.getElementById("solutions"+n);
	
	for(var i=0;i<num;i++){
		if(n==i){
			o.className="on";
		}else{
			o.parentNode.children[i].className="out";
		}
	}
	
	for(var j=0;j<t;j++){
		var tId = document.getElementById("solutions"+j);
		if(n==j){
			nId.className="contents blcok";			
		}else{
			tId.className="contents none";	
		}
	}	
}




function showTab(o,n,t){
	var num = o.parentNode.children.length;
	var nId = document.getElementById("contents"+n);
	
	for(var i=0;i<num;i++){
		if(n==i){
			o.className="on";
		}else{
			o.parentNode.children[i].className="out";
		}
	}
	
	for(var j=0;j<t;j++){
		var tId = document.getElementById("contents"+j);
		if(n==j){
			nId.className="contents block";			
		}else{
			tId.className="contents none";	
		}
	}
}

function showMenu(o,n){
	var num = o.parentNode.children.length;
	var nId = document.getElementById("menu"+n);
	for(var i=0;i<num;i++){
		if(n==i){
			o.className="on";
		}else{
			o.parentNode.children[i].className="";
		}
	}
	
}

function showNav(n,t){
	
	for(var i=0;i<t;i++){
		if(n==i){
			document.getElementById("nav"+n).className="on";
		}else{
			document.getElementById("nav"+i).className="";
		}
	}
	
}

function answer(n,t){
	var o = document.getElementsByTagName("textarea");	
	for(var i=0;i<o.length;i++){
		if((n==i)&&t){
			o[n].parentNode.className="question_answer";
		}else{
			o[i].parentNode.className="question_answer none";
		}
	}
}