对鼠标移到图片上及离开图片时，图片背景颜色改变的JS实现

<script language="javascript">

function changecolor(obj)
{
document.getElementById(obj).style.background = "blue";
}

function colorout(obj)
{
document.getElementById(obj).style.background = "";
}

</script>



其中，obj为控件的id，响应事件为onmouseover=changecolor("id"),onmouseout=colorout("id").