js定义鼠标经过变换图片

function changeImg(id, path)

{

document.getElementByIdx_x(id).src=path;

}

示例：

 

<a href="#"><img id="img3" src="images/topmenu_03_1.jpg " width="83" height="36"

onMouseOver="changeImg('img3','images/topmenu_03_2.jpg')"

onMouseOut="changeImg('img3','images/topmenu_03_1.jpg')"></a>