lastScrollY = 0;
function heartBeat() {
    var diffY;
    if (document.documentElement && document.documentElement.scrollTop)
        diffY = document.documentElement.scrollTop;
    else if (document.body)
        diffY = document.body.scrollTop
    else
    { /*Netscape stuff*/ }
    percent = .1 * (diffY - lastScrollY);
    if (percent > 0) percent = Math.ceil(percent);
    else percent = Math.floor(percent);
    var d = document.getElementById("loginform")
    d.style.top = d.style.top == "" ? "100px" : d.style.top
    d.style.top = parseInt(d.style.top) + percent + "px"
    lastScrollY = lastScrollY + percent;
}

window.setInterval("heartBeat()", 1);
function groupclose() {
    document.getElementById("loginform").style.display = 'none';
    //document.getElementById("page_cover").style.display='none';
}
function openPageCover1() {
    openPageCover();
    document.getElementById("table1").style.display = 'none';
    document.getElementById("table2").style.display = '';
}
function openPageCover() {
    var screenHeight = screen.height;
    var screenWidth = screen.width;
    var aa = document.getElementById("bodyid").offsetHeight;
    screenHeight = document.getElementsByTagName('body')[0].offsetHeight;
    if (screenHeight < aa) {
        screenHeight = aa;
    }
    /*document.getElementById("page_cover").style.display="";
    document.getElementById("page_cover").style.width=(screenWidth-334)+"px";
    document.getElementById("page_cover").style.height=(screenHeight-600)+"px";
    document.getElementById("page_cover").className="t"*/
    document.getElementById("loginform").style.position = "absolute"

    document.getElementById("loginform").style.left = (screenWidth / 2 - 600) + "px";
    document.getElementById("loginform").style.display = "";
}

function hiddentisi() {
    openPageCover()

}

function check(theForm) {
    if (theForm.UserName.value == '') {
        alert("请输入用户名");
        theForm.UserName.focus();
        return false;
    }
    if (theForm.Password.value == '') {
        alert("请输入密码");
        theForm.Password.focus();
        return false;
    }
}
//window.onload= hiddentisi