document.write("<div id=\"floatad\" style=\"position:absolute;z-index: 9999;\">");
document.write("<a href=\"http://www.jkb.com.cn/xygjj.jsp\" target=\"_blank\">");
document.write("<img src=\"/Images/logo_of.png\" border=\"0\" />");
document.write("</a></div>");
var adx = 50, ady = 60;   /*图片的初始位置*/
var xin = true, yin = true; /*向右和向下移动的标记*/
var step = 1; /*移动的步长*/
var delay = 10; /*移动的间隔为10ms*/
var floatobj = document.getElementById("floatad");
function floatAD() {
    var L = T = 0;       /*L、T、R、B分别为图片可以移动的左横坐标、上纵坐标、右横坐标和下纵坐标*/
    var R = document.body.clientWidth - floatobj.offsetWidth;
    var B = document.body.clientHeight - floatobj.offsetHeight;
    floatobj.style.left = adx + document.body.scrollLeft; /*图片的坐标应该随着页面的流动而改变*/
    floatobj.style.top = ady + document.body.scrollTop;
    adx = adx + step * (xin ? 1 : -1);    /*图片的运动方向要随着坐标的变化而变化*/
    if (adx < L) { xin = true; adx = L };
    if (adx > R) { xin = false; adx = R };
    ady = ady + step * (yin ? 1 : -1);
    if (ady < T) { yin = true; ady = T };
    if (ady > B) { yin = false; ady = B };
}
var itl = setInterval("floatAD()", delay);
floatobj.onmouseover = function() { clearInterval(itl); };  /*当鼠标在图片上时图片要停止移动*/
floatobj.onmouseout = function() { itl = setInterval("floatAD()", delay); };