function setFocus3(i)
{ selectLayer3(i);}
function selectLayer3(i)
{switch(i) {
case 1:
document.getElementById("N1").className="toocle2";
document.getElementById("N2").className="toocle1";
document.getElementById("N3").className="toocle1";
break;
case 2:
document.getElementById("N1").className="toocle1";
document.getElementById("N2").className="toocle2";
document.getElementById("N3").className="toocle1";
break;
case 3:
document.getElementById("N1").className="toocle1";
document.getElementById("N2").className="toocle1";
document.getElementById("N3").className="toocle2";
break;}}




function scrollDoor(){
}
scrollDoor.prototype = {
	sd : function(menus,divs,openClass,closeClass){
		var _this = this;
		if(menus.length != divs.length)
		{
			alert("菜单层数量和内容层数量不一样!");
			return false;
		}				
		for(var i = 0 ; i < menus.length ; i++)
		{	
			_this.$(menus[i]).value = i;				
			_this.$(menus[i]).onmouseover = function(){
					
				for(var j = 0 ; j < menus.length ; j++)
				{						
					_this.$(menus[j]).className = closeClass;
					_this.$(divs[j]).style.display = "none";
				}
				_this.$(menus[this.value]).className = openClass;	
				_this.$(divs[this.value]).style.display = "block";				
			}
		}
		},
	$ : function(oid){
		if(typeof(oid) == "string")
		return document.getElementById(oid);
		return oid;
	}
}
window.onload = function(){
	var SDmodel = new scrollDoor();
	SDmodel.sd(["mmmmm01","mmmmm02","mmmmm03"],["ccccc01","ccccc02","ccccc03"],"sd01","sd02");
 
}