function cheakSubmit(){
        
        if(document.getElementById("username_put").value=="")
        {
            alert("请输入用户名");
            
            return false;
        }
        if(document.getElementById("pass_put").value=="")
        {
            alert("请输入密码");
            
            return false;
        }
        
        else
        {
            doSubmit();
            return false;
        }
        
    }
    function createForm(){
		var obj = document.createElement( 'form' );
		
		obj.action = 'http://bbs.gigabyte.cn/login.aspx';
		obj.method = 'post';
		
		document.getElementsByTagName( 'body' )[0].appendChild( obj );
		
		return obj;
	}
	
	function createInput( parentobj, objname ){
		var obj = document.createElement( 'input' );
		obj.name = objname;
		obj.id = objname;
		obj.type = 'hidden';
		parentobj.appendChild( obj );
		return obj;
	}
	
	function doSubmit(){
	    
	    var comeUrl_one = window.location.href;
	    
		var formobj = createForm();
		
		var username = createInput( formobj, 'username' );
		
		var pass = createInput( formobj, 'password' );
		
		var backurl = createInput(formobj,'referer');
		
		backurl.value = comeUrl_one;
		
		username.value = document.getElementById( 'username_put' ).value;
		
		pass.value = document.getElementById( 'pass_put' ).value;
		
		formobj.submit();
		
	}
	
	function show(obj1,obj2,obj3){
	
		if(obj1=='zuixin')
		{
			document.getElementById("zuixin").src="images/biao_t1.jpg";
			
			document.getElementById("tuijian").src="images/biao_t3_3.jpg";
			
			document.getElementById("remen").src="images/biao_t2_2.jpg";
		}
		if(obj1=="remen")
		{
			document.getElementById("remen").src="images/biao_t2.jpg";
			
			document.getElementById("zuixin").src="images/biao_t1_1.jpg";
			
			document.getElementById("tuijian").src="images/biao_t3_3.jpg";
		}
		if(obj1=="tuijian")
		{
			document.getElementById("tuijian").src="images/biao_t3.jpg";
			
			document.getElementById("remen").src="images/biao_t2_2.jpg";
			
			document.getElementById("zuixin").src="images/biao_t1_1.jpg";
		}
		document.getElementById(obj1+"_content").style.display='block';
		
		document.getElementById(obj2+"_content").style.display='none';
		
		document.getElementById(obj3+"_content").style.display='none';
		
	}
	
    function show_di(obj)
    {
	
        document.getElementById("di_"+obj).style.display="block";
        for(var i=1;i<8;i++)
        {
            if(i==obj)
            {
                
            }
            else
            {
                document.getElementById("di_"+i).style.display = "none";
            }
           
        }
    }
    
	function initImg(){
		
		document.getElementById("img_big").src= img_sm[0];		//设置初始化 大图
		
		document.getElementById("img_big").parentNode.href = img_a[0];	//初始化第一张大图的链接地址
		
		document.getElementById("img_font_show").innerHTML = img_font[0];	//初始化第一张大图的文字
		
		document.getElementById("img_font_show").parentNode.href = img_a[0];	//初始化第一张大图的文字
		
		for(var i=0;i<4;i++)		//初始化小图
		{
			var temp = i + 1 ;
		
			document.getElementById("img_small_"+temp).src = img_sm[i];
		}
		setInterval("aotoShow()", 3000);
	}
	
	function showBigImg(obj,Num_a)
	{
	    document.getElementById("biaoji").value = -1;
	
		document.getElementById("img_big").src= obj.src;
		
		for(var i=1;i<5;i++)
		{
			document.getElementById("bg_small_"+i).style.backgroundImage = "";
		}
		
		obj.parentNode.style.backgroundImage = "url(images/active_img_small.jpg)";	//设置小图背景图片
		
		document.getElementById("img_font_show").innerHTML = img_font[Num_a];
		
		document.getElementById("img_font_show").parentNode.href = img_a[Num_a];	
		
		document.getElementById("img_big").parentNode.href = img_a[Num_a];		//设置大图片的链接地址
		
		//alert(obj.parentNode.style.backgroundImage);
	}
	
	
	
	function aotoShow()
{
	var biaoji_get = Number(document.getElementById("biaoji").value);
	
	biaoji_2 = Number(biaoji_get) + 1;
	
	if(biaoji_get == -1)
	{
	
	}
	else
	{
	if(biaoji_get < 4)
	{
		document.getElementById("bg_small_1").style.backgroundImage = "";
		document.getElementById("bg_small_2").style.backgroundImage = "";
		document.getElementById("bg_small_3").style.backgroundImage = "";
		document.getElementById("bg_small_4").style.backgroundImage = "";
		
		document.getElementById("bg_small_"+biaoji_2).style.backgroundImage = "url(images/active_img_small.jpg)";	//设置小图背景图片
		
		document.getElementById("img_font_show").innerHTML = img_font[biaoji_get];
			
		document.getElementById("img_font_show").parentNode.href = img_a[biaoji_get];	
			
		document.getElementById("img_big").parentNode.href = img_a[biaoji_get];		//设置大图片的链接地址
		
		document.getElementById("img_big").src = img_sm[biaoji_get];
		
		if(biaoji_get!=3)
		{
			biaoji_get = biaoji_get + 1;
		}
		else
		{
			biaoji_get = 0;
		}
		document.getElementById("biaoji").value = biaoji_get;
	}
	else
	{
		document.getElementById("biaoji").value = 0;
	}
	}
}
function showImgs(obj)
	{
		document.getElementById("biaoji").value = obj;
	}
	
function stopAoto()
{
	document.getElementById("biaoji2").value = document.getElementById("biaoji").value;
	document.getElementById("biaoji").value = -1;
	}
function startAoto()
{
	document.getElementById("biaoji").value = document.getElementById("biaoji2").value;
	
	}