var divArticleList = document.all.divArticleList;
var divPage = document.all.divPage;
var btnPre = document.all.btnPre;
var btnNext = document.all.btnNext;
var btnPage = document.all.btnPage;
var currentPageIndex;

//默认显示第一页
PageIndexChange(1);

function PageIndexChange(pageIndex)
{
    var i;
    
    if(!divArticleList)
    {
        divPage.innerHTML = "该分类没有文章";
        return;
    }
    
    if(divArticleList.length)
    {
        //隐藏所有页
        for(i=0;i<divArticleList.length;i++)
        {
            divArticleList[i].style.display = "none";
            btnPage[i].className = "c1";
        }
        
        //显示指定页
        divArticleList[pageIndex - 1].style.display = "";
        btnPage[pageIndex - 1].className = "";
    }
    else
    {
        divArticleList.style.display = "";
        btnPage.className = "";
    }
    
    //设置当前页码
    currentPageIndex = pageIndex;
    
    //设置翻页按钮样式
    if(pageIndex == 1)
    { 
        btnPre.disabled = "disabled";
        btnPre.href = "javascript:alert('没有上一页了！')";
    }
    else
    {
        btnPre.disabled = "";
        btnPre.href = "javascript:PrePage()";
    }
    
    if(divArticleList.length)
    {
        if(pageIndex == divArticleList.length)
        {
            btnNext.disabled = "disabled";
            btnNext.href = "javascript:alert('没有下一页了！')";
        }
        else
        {
            btnNext.disabled = "";
            btnNext.href = "javascript:NextPage()";
        }
    }
    else
    {
        btnNext.disabled = "disabled";
        btnNext.href = "javascript:alert('没有下一页了！')";
    }
}

function PrePage()
{
    PageIndexChange(currentPageIndex - 1)
}

function NextPage()
{
    PageIndexChange(currentPageIndex + 1)
}