// JavaScript Document
var waitting = 1;
var secondLeft = waitting;
var timer;				
var sourceObj;
var number;
//showM("mm" + number,number);
showM("mm1",1);



//获取id的函数 
function getObject(objectId){
	if(document.getElementById && document.getElementById(objectId)){
		// W3C DOM
		return document.getElementById(objectId);
	}else if(document.all && document.all(objectId)){
		// MSIE 4 DOM
		return document.all(objectId);
	}else if(document.layers && document.layers[objectId]){
		// NN 4 DOM.. note: this won't find nested layers
		return document.layers[objectId];
	}else{
		return false;
	}
}

//主导航时间延迟的函数
function SetTimer(){
	for(j=1;j<20;j++){
		var img = j+3;
		var img2 = String(img) + String(img);
		if (j == number){
			if(getObject("mm"+j)!=false){
				getObject("mm"+ number).className = "up";
				getObject("mb"+ number).className = "menubottom"+j;
				//alert(img2);
				getObject("img"+ number).src = "images/menu" + img2 + ".gif";
			}
		}else{
			if(getObject("mm"+j)!=false){ 
				if(j ==1){
					getObject("mm1").className = "";
					getObject("mb1").className = "hide";
					getObject("img1").src = "images/menu4.gif";
				}else{
					getObject("mm"+ j).className = "";
					getObject("mb"+ j).className = "hide";
					//alert(img);
					getObject("img"+ j).src = "images/menu" + img + ".gif";
				}
			}
		}
	}
}

//设置时间延迟后
function CheckTime(){
	secondLeft--;
	if( secondLeft == 0 ){
		clearInterval(timer);						
		SetTimer();		
	}
}

//主导航鼠标滑过函数，带时间延迟
function showM(thisobj,Num){
	number = Num;
	sourceObj = thisobj;
	secondLeft = 1;
	timer = setTimeout('CheckTime()',0);
}

//主导航鼠标移出函数，清除时间函数
function OnMouseLeft(){
	clearInterval(timer);
}