JavaScript问题高手一定帮我看看
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN " "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
<html xmlns= "http://www.w3.org/1999/xhtml ">
<head>
<meta http-equiv= "Content-Type " content= "text/html; charset=gb2312 " />
<title> 隐藏的浮动导航面板 </title>
<script type= "text/javascript ">
<!--
var menu_width = 150;
var show_width = 20
var menu_top = 40;
var move_mode = "a ";
function init()
{
addMenuHeader();
addItem( "电科技大 ", "http://www.sohu.com ", "_blank ");
addItem( "清华大学 ", "http://www.sohu.com ", "_blank ");
addItem( "北京大学 ", "http://www.sohu.com ", "_blank ");
addItem( "上海交大 ", "http://www.sohu.com ", "_blank ");
addMenuFoot();
document.getElementById( 'float_menu ').style.left = menu_width;
document.getElementById( 'float_menu ').style.visibility = "visible ";
}
function addMenuHeader()
{
var content = " <div id = 'float_menu ' style = 'position.absolute; left:0px; top:0px; '+menu_top+ ' width: ' "+eval(menu_width+20+2)+ "; ' onmouseover = ' "+moveOut()+ "; ' onmouseout = ' "+moveBack()+ "; '> ";
content += " <table width = '100% ' cellpadding = '0 ' cellspacing = '1 ' bgcolor = '#555555 '> ";
content += " <tr height = '20 '> ";
content += " <td style= 'background:#eeffff; ' width = ' "+menu_width+ " '> ";
content += "菜单项 </td> ";
content += " <td style= 'background:#c0edcc; ' rowspan = '50 ' width = ' "+eval(show_width + 2)+ "; ' ";
content += "大 <br> 学 <br> 链 <br> 接 <br> ";
content += " </td> </tr> ";
alert(content);
document.write(content);
}
function addMenuFoot()
{
content = " </table> </div> ";
document.write(content);
}
function addItem(text,url,target)
{
if(!target || target == " ")
{
target = "_blank ";
}
content = " <tr height = '20px '> <td style= 'background:#eeeeff; '> ";
content += " <a href = ' "+url+ " ' target= ' "+target+ " '> " + text;
content += " </a> </td> </tr> ";
document.write(content);
}
function moveOut()
{