回车转换成Tab

<script language="javascript" for="document" event="onkeydown"> 
if(event.keyCode==13 && event.srcElement.type!=’button’ && event.srcElement.type!=’submit’ && event.srcElement.type!=’reset’ && event.srcElement.type!=’’&& event.srcElement.type!=’textarea’); 
event.keyCode=9; 
</script> 

onkeydown="if(event.keyCode==13) event.keyCode=9"