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javascript 焦点的两个问题

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml" > 
<head> 
<title>无标题页</title> 
 
<img src="/_New/_cj/myeditor/sysimage/space.gif" class="ewebeditor__script" _ewebeditor_fake_tag="script" _ewebeditor_fake_value="%3Cscript%20type%3D%22text%2Fjavascript%22%3E%3C!--%20%0D%0Avar%20%24%3Dfunction(id)%20%0D%0A%7B%20%0D%0Areturn%20document.getElementById(id)%3B%20%0D%0A%7D%20%0D%0Afunction%20ShowTar()%20%0D%0A%7B%20%0D%0A%24(%22R0%22).focus()%3B%20%0D%0A%7D%20%0D%0Afunction%20key_down(Target)%20%0D%0A%7B%20%0D%0Aif(event.keyCode%3D%3D13)%20%0D%0A%7B%20%0D%0Aif(Target%3D%3D%22R0%22)%20%0D%0A%7B%20%0D%0A%24(%22R1%22).focus()%3B%20%0D%0A%7D%20%0D%0Aelse%20if(Target%3D%3D%22R1%22)%20%0D%0A%7B%20%0D%0A%24(%22R2%22).focus()%3B%20%0D%0A%7D%20%0D%0Aelse%20if(Target%3D%3D%22R2%22)%20%0D%0A%7B%20%0D%0A%24(%22R3%22).focus()%3B%20%0D%0A%7D%20%0D%0A%7D%20%0D%0A%7D%20%0D%0A%2F%2F%20--%3E%3C%2Fscript%3E"> 
</head> 
<body onload="ShowTar()"> 
<input name="R0" id="R0" type="text" size="3" maxlength="1" onkeydown="key_down(id)"/> 
<input name="R1" id="R1" type="text" size="3" maxlength="1" onkeydown="key_down(id)"/> 
<input name="R2" id="R2" type="text" size="3" maxlength="1" onkeydown="key_down(id)"/> 
<input name="R3" id="R3" type="text" size="3" maxlength="1" onkeydown="key_down(id)"/> 
</body> 
</html>

　　 [Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

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