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我想做一个可以选择的表单，
例： 在下拉式菜单里选择在线论坛，接下来输入用户和密码就转到论坛去，
若在下拉式菜单里选择聊天，输入用户和密码就转到聊天页里去。
下面是我做的代码，测试不可以，不知道错在哪里，帮我看一看，谢谢 !!
<table width="98%" height="119" border="1" align="center" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF">
<tr>
<td><table width="122" border="0" align="center" cellpadding="0" cellspacing="0">
<script language="JavaScript">
function form1check()
{
if(document.form1.username.value==){alert("请先输入用户帐号!");document.form1.username.focus();return false;}
document.form1.action=document.form1.type.value;
return true;
}
</script>
<form name=form1 method=post target=_blank action="" onsubmit="javascript:return form1check()">
<tr>
<td height="25" align="center"> <span class="font">选择</span>
<select name="select" class="bor">
<option value="http://10.105.140.4/eisvweb/dologon.ssc" selected>教师登录</option>
<option value="10.105.140.4:8088/infor/squery/login.jsp">学生自查</option>
</select> </td>
</tr>
<tr>
<td height="25" align="center"><span class="font">用户</span>
<input style="BACKGROUND-COLOR: #fffbff; BORDER-BOTTOM: #c0c0c0 1px solid; BORDER-LEFT: #c0c0c0 1px solid; BORDER-RIGHT: #c0c0c0 1px solid; BORDER-TOP: #c0c0c0 1px solid" size="8" name=uid >
</td>
</tr>
<tr>
<td height="25" align="center"><span class="font">密码</span>
<INPUT class=imput id=password name=pwd
onmouseout="this.style.backgroundColor = "
onmouseover="this.style.backgroundColor = #E5F0FF" size=8
style="BACKGROUND-COLOR: #fffbff; BORDER-BOTTOM: #c0c0c0 1px solid; BORDER-LEFT: #c0c0c0 1px solid; BORDER-RIGHT: #c0c0c0 1px solid; BORDER-TOP: #c0c0c0 1px solid" type="password">
</td>
</tr>
<tr valign="bottom">
<td height="30" align="center"> <input type="hidden" name="mode2" value="4">
<input type="image" border="0" name="imageField22" src="images/logoimages.gif" width="71" height="23">
</td>
</tr>
</form>
</table></td>
</tr>
</table>
<script language="JavaScript">
function form1check()
{
if(document.form1.uid.value==){alert("请先输入用户帐号!");document.form1.uid.focus();return false;}
document.form1.action=document.form1.select.value;
return true;
}
</script>
<table width="98%" height="119" border="1" align="center" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF">
<tr>
<td><table width="122" border="0" align="center" cellpadding="0" cellspacing="0">
<script language="JavaScript">
function form1check()
{
if(document.form1.username.value==){alert("请先输入用户帐号!");document.form1.username.focus();return false;}
document.form1.action=document.form1.type.value;
return true;
}
</script>
<form name=form1 method=post target=_blank action="" onsubmit="javascript:return form1check()">
<tr>
<td height="25" align="center"> <span class="font">选择</span>
<select name="type" class="bor">
<option value="http://10.105.140.4/eisvweb/dologon.ssc" selected>教师登录</option>
<option value="10.105.140.4:8088/infor/squery/login.jsp">学生自查</option>
</select> </td>
</tr>
<tr>
<td height="25" align="center"><span class="font">用户</span>
<input style="BACKGROUND-COLOR: #fffbff; BORDER-BOTTOM: #c0c0c0 1px solid; BORDER-LEFT: #c0c0c0 1px solid; BORDER-RIGHT: #c0c0c0 1px solid; BORDER-TOP: #c0c0c0 1px solid" size="8" name=username >
</td>
</tr>
<tr>
<td height="25" align="center"><span class="font">密码</span>
<INPUT class=imput id=password name=pwd
onmouseout="this.style.backgroundColor = "
onmouseover="this.style.backgroundColor = #E5F0FF" size=8
style="BACKGROUND-COLOR: #fffbff; BORDER-BOTTOM: #c0c0c0 1px solid; BORDER-LEFT: #c0c0c0 1px solid; BORDER-RIGHT: #c0c0c0 1px solid; BORDER-TOP: #c0c0c0 1px solid" type="password">
</td>
</tr>
<tr valign="bottom">
<td height="30" align="center"> <input type="hidden" name="mode2" value="4">
<input type="image" border="0" name="imageField22" src="images/logoimages.gif" width="71" height="23">
</td>
</tr>
</form>
</table></td>
</tr>
</table>
