在线急等，用javascript写一个动态对

Question

给你个例子吧：<script language="JavaScript">
function doMenu(theObj,MenuIDStr) {
    if (theObj.src.indexOf("Tminus.gif") == -1) {
        theObj.src = "../image/Tminus.gif";
    } else {
        theObj.src = "../image/Tplus1.gif";
    }    if(MenuIDStr.style.visibility == "hidden"){
        MenuIDStr.style.visibility = "visible";
        MenuIDStr.style.position = "static";
    } else {
        MenuIDStr.style.visibility = "hidden";
        MenuIDStr.style.position = "absolute";
    }
    return true;
}
</script><table width="140" border="0" cellspacing="0" cellpadding="0" bgcolor="#addcfc">
<tr>
    <td><a href="#" onclick="doMenu(img1,Layer1)"><IMG align=top border=0
        class=icon src="../image/Tplus1.gif" id="img1"></A><A
        href="#" onclick="doMenu(img1,Layer1)"><IMG align=top border=0
        class=icon src="../image/ICO.gif"><FONT color=#000000
        style="COLOR: black; CURSOR: hand; DISPLAY: inline; FONT-SIZE: 10pt; OVERFLOW: hidden; TEXT-DECORATION: none; font-face: Times"
        ><SPAN title=&Egrave;¨&Iuml;&THORN;&Icirc;&not;&raquo;¤>&Egrave;¨&Iuml;&THORN;&Icirc;&not;&raquo;¤</SPAN></FONT></A>
</td>
</tr>
<Tr>
<td>
<div id="Layer1" style="position:absolute;   z-index:2;  visibility: hidden" align="right">
<table width="120" border="0" cellspacing="0" cellpadding="0">
<tr>
<td>
<img border="0" src="../image/T.gif"><A
                href="yhqxwh.jsp" target="mainFrame"><IMG align=top border=0
                class=icon src="../image/ICO.gif"><FONT color=#000000
                style="COLOR: black; CURSOR: hand; DISPLAY: inline; FONT-SIZE: 10pt; OVERFLOW: hidden; TEXT-DECORATION: none; font-face: Times"
                ><SPAN title=&Oacute;&Atilde;&raquo;§&Icirc;&not;&raquo;¤>&Oacute;&Atilde;&raquo;§&Icirc;&not;&raquo;¤</SPAN></FONT></a>
</td>
</tr>
<tr>
            <td>
<img border="0" src="../image/T.gif"><A
                href="#" target="mainFrame"><IMG align=top border=0
                class=icon src="../image/ICO.gif"><FONT color=#000000
                style="COLOR: black; CURSOR: hand; DISPLAY: inline; FONT-SIZE: 10pt; OVERFLOW: hidden; TEXT-DECORATION: none; font-face: Times"
                ><SPAN title=×é&Icirc;&not;&raquo;¤>×é&Icirc;&not;&raquo;¤</SPAN></FONT></a>
</td>
</tr>
</table></div>
</td>
</tr>
</table>