发表日志时添加转贴、原创等选项！

<select id="logtype" onchange="changeT()">
<option value="">选择话题</option>
<option value="[原创]">[原创]</option>
<option value="[转载]">[转载]</option>
</select>
<script language="javascript">
function changeT()
{var t = document.getElementById("logtype");
var n = document.getElementById("topic");
n.value = t.value + n.value.replace("[转载]","").replace("[原创]","");
}
</script>

<select  id="c1"  onchange="a()">
<option>选择话题</option>
<option  value="">[原创]</option>
<option  value="">[转载]</option>
</select>
<script> 
function  a() 
{ 
var  s1  =  document.all.c1[document.all.c1.selectedIndex].text; 
var  s2
if(s1  ==  "选择话题") 
s2  =  ""; 
else
 s2  =  s1; 
document.all.topic.value=s2; 
} 
</script>

<option value="">类型</option>
<option value="[原]">原</option>
<option value="[转]">转</option>
</select>
<script>
function CHangeT()
{
var t = document.getElementById("logtype");
var n = document.getElementById("topic");
ChangeHead();
} function CHeckType()
{
}
function IndexOfHead()
{  var n = document.getElementById("topic");
 if( n.value.indexOf("[转]")>=0 || n.value.indexOf("[原]")>=0)
 {return true;}
 else
 {
  return false;
 }
}
function ChangeHead()
{  var t = document.getElementById("logtype");
 var n = document.getElementById("topic");
n.value = t.value + n.value.replace("[转]","").replace("[原]",""); //alert(IndexOfHead());
/*
 if(!IndexOfHead())
 {
  n.value = t.value + n.value;
 }else
 {
  n.value = t.value + n.value.replace("[转]","").replace("[原]","");
 }
*/
}
</script>