保持div滚动条的状态 使用cookie记录位置

<div class="mint" id="mint" style="position: absolute; left: 5px; top: 5px; right: 5px;
bottom: 5px; width: auto; height: auto; overflow: scroll" onscroll="setCookie('t',this.scrollTop)">
<div class="report_plfs">
<a href="javascript:void(0);" class="radioA" showdiv="iconList"><b class="r_icon1"></b>
<em>图标排列</em> </a><a href="javascript:void(0);" showdiv="groupSort" class="radioA r_checked">
<b class="r_icon2"></b><em>分组排列</em> </a>
</div>

</div>

<script>
function setCookie(cookieName, cookieValue) {
var today = new Date();
var expire = new Date();
nMinutes = 100;
expire.setTime(today.getTime() + nMinutes * 60 * 1000);
document.cookie = cookieName + "=" + escape(cookieValue) + ";expires=" + expire.toGMTString();
};

function getCookie(c_name) {
if (document.cookie.length > 0) {
c_start = document.cookie.indexOf(c_name + "=");
if (c_start != -1) {
c_start = c_start + c_name.length + 1;
c_end = document.cookie.indexOf(";", c_start);
if (c_end == -1) c_end = document.cookie.length;
return unescape(document.cookie.substring(c_start, c_end));
}
}
return "";
};

function getscrolltop() {
var t = getCookie("t")
if (t != "") { document.getElementById("mint").scrollTop = parseInt(t); }
};

window.onload = function () {
getscrolltop();
};
</script>