<script language="javascript">
<!--
function backcolor(form){
 temp = ""
 for (var i = 0; i < 16; i++) {
  temp = form.color[i].value
  if (form.color[i].checked){
document.bgColor = temp }
  }
 }
function randombackground(){
 document.bgColor = getColor()
 }
function getColor(){
 currentdate = new Date()
 backgroundcolor =
currentdate.getSeconds()
 if (backgroundcolor > 44)
  backgroundcolor =
backgroundcolor - 45
 else if (backgroundcolor > 29)
  backgroundcolor =
backgroundcolor - 30
 else if (backgroundcolor > 15)
  backgroundcolor =
backgroundcolor - 16
 if (backgroundcolor == 0 )
  return "olive";
 else if (backgroundcolor == 1 )
  return "teal";
 else if (backgroundcolor == 2 )
  return "red";
 else if (backgroundcolor == 3 )
  return "blue";
 else if (backgroundcolor == 4 )
  return "maroon";
 else if (backgroundcolor == 5 )
  return "navy";
 else if (backgroundcolor == 6 )
  return "lime";
 else if (backgroundcolor == 7 )
  return "fuschia";
 else if (backgroundcolor == 8 )
  return "green";
 else if (backgroundcolor == 9 )
  return "purple";
 else if (backgroundcolor == 10 )
  return "gray";
 else if (backgroundcolor == 11 )
  return "yellow";
 else if (backgroundcolor == 12 )
  return "aqua";
 else if (backgroundcolor == 13 )
  return "black";
 else if (backgroundcolor == 14 )
  return "white";
 else if (backgroundcolor == 15 )
  return "silver";
 }
// -->
</script>
<a HREF=http://www.renwen.net
onMouseOver="randombackground()">

<p>鼠标背景</a></p>