function top() {
	document.writeln("<div id=\"top\"><a href=\"#a\"><img src=\"\/images\/style\/top.gif\" alt=\"top\" border=\"0\" \/><\/a><\/div>")
	}

var tips; var theTop = 450/*这是默认高度,越大越往下*/; var old = theTop;
function initFloatTips() {
  tips = document.getElementById('top');
  moveTips();
};
function moveTips() {
  var tt=50;
  if (window.innerHeight) {
    pos = window.pageYOffset
  }
  else if (document.documentElement && document.documentElement.scrollTop) {
    pos = document.documentElement.scrollTop
  }
  else if (document.body) {
    pos = document.body.scrollTop;
  }
  pos=pos-tips.offsetTop+theTop;
  pos=tips.offsetTop+pos/10;
  if (pos < theTop) pos = theTop;
  if (pos != old) {
    tips.style.top = pos+"px";
    tt=10;
  }
  old = pos;
  setTimeout(moveTips,tt);
}