判断宽度的js

<script language="javascript" type="text/javascript">

/*将获取的值存到变量里*/

width_screen=screen.width;

height_screen=screen.height;

availWidth_screen=screen.availWidth;

availHeight_screen=screen.availHeight;

colorDepth_screen=screen.colorDepth;

/*end*/

/*输出值*/

document.write("你的屏幕宽为："+width_screen+"<br />你的屏幕高为："+height_screen+"<br />你的屏幕可用宽为："+availWidth_screen+"<br />你的屏幕可用高为："+availHeight_screen+"<br />你的颜色设置所有为数为："+colorDepth_screen);

/*end*/

</script>

<script type="text/javascript">

document.getElementById("sub_left").style.height=document.getElementById("s_content").scrollHeight+"px";

document.getElementById("sub_right").style.height=document.getElementById("s_content").scrollHeight+"px";

</script>