function piaofu(imgid, delay, xVal, yVal, closeDiv) {
 //imgid 漂浮标签的id
 //delay 速度，越小越快
 // xVal 初始x方向 值为1或者-1
 //yVal 初始y方向 值为2或者-2
 var kktime;
 var height;
 var width;
 if (document.documentElement && document.documentElement.clientHeight && document.documentElement.clientWidth) {
 height = document.documentElement.clientHeight;
 width = document.documentElement.clientWidth - 12; //12为滚动条宽度、px
 }
 $(imgid).hover(
 function () { clearInterval(kktime); $(closeDiv).click(function () { $(imgid).hide() }) },
 function () {
 kktime = setInterval(function () {
 var k = xVal + yVal;
 var bodyScrollLeft = $("body").scrollLeft();
 var bodyScrollTop = $(imgid).scrollTop();
 var imgidLeft = $(imgid).css("left");
 imgidLeft = imgidLeft.replace(/[^0-9]/ig, "");
 var imgidTop = $(imgid).css("top");
 imgidTop = imgidTop.replace(/[^0-9]/ig, "");
 var thisWidth = $(imgid).width();
 var thisHeight = $(imgid).height();
 if (k == 3) {
 imgidLeft++;
 imgidTop--;
 }
 if (k == 1) {
 imgidLeft--;
 imgidTop--;
 }
 if (k == -1) {
 imgidLeft++;
 imgidTop++;
 }
 if (k == -3) {
 imgidLeft--;
 imgidTop++;
 }
 $(imgid).css("left", imgidLeft + bodyScrollLeft);
 $(imgid).css("top", imgidTop + bodyScrollTop);
 if (imgidLeft <= bodyScrollLeft || imgidLeft >= width - bodyScrollLeft - thisWidth) {
 xVal = -xVal;
 }
 if (imgidTop >= height - bodyScrollTop - thisHeight || imgidTop <= bodyScrollTop) {
 yVal = -yVal;
 }

 }, delay);
 }
 ).trigger("mouseleave");
 }
 piaofu('#float_img', 20, 1, 2, '#close_btn');
 piaofu('#float_img1', 20, -1, 2, '#close_btn1');
 piaofu('#float_img2', 20, 1, -2, '#close_btn2');
 piaofu('#float_img3', 20, -1, -2, '#close_btn3');