支持按回车键提交的搜索功能

<div class="searchMh">
<a onclick="submitup()" id="searchName" target="_blank" title="" href="##">搜索</a><input type="text" onkeydown="if(event.keyCode==13){submitup()}" value="请输入关键词" x-webkit-speech="" x-webkit-grammar="builtin:translate" autocomplete="off" onfocus="if(this.value=='请输入关键词')this.value=''" id="searchTA">
</div>
<script type="text/javascript">
//搜索
function _O(s){
return document.getElementById(s)
}
var searchV=_O("searchTA");
var searchN=_O("searchName");
searchN.onclick=function(){
var Svalue=searchV.value;
lsherf="http://ac.qq.com/Comic/searchList/search/"+Svalue;
document.getElementById("searchName").setAttribute("href",lsherf);
}
function submitup(){
var Svalue=searchV.value;
submtupurl="http://ac.qq.com/Comic/searchList/search/"+Svalue;
window.open(submtupurl);
}
</script>