window.onload=function(){
    var hpn= document.getElementById("hpn");
    var strHref=document.getElementById("strHref");
    function showdiv(){
        hpn.style.display = "block";
        strHref.href = "javascript:hidediv();";
        strHref.innerHTML = "收起-";
    }
    function hidediv(){
        hpn.style.display = "none";
        strHref.href = "javascript:showdiv();";
        strHref.innerHTML = "展开+";
    }
}