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兼容firefox的文本框只能输入两位小数的数字的代码

<html> 
<body> 
<img src="/_New/_cj/myeditor/sysimage/space.gif" class="ewebeditor__script" _ewebeditor_fake_tag="script" _ewebeditor_fake_value="%3Cscript%3E%20%0D%0Afunction%20checkNumber(e%2Ctxt)%20%0D%0A%7B%20%0D%0Avar%20key%20%3D%20window.event%20%3F%20e.keyCode%20%3A%20e.which%3B%20%0D%0Avar%20keychar%20%3D%20String.fromCharCode(key)%3B%20%0D%0Avar%20el%20%3D%20document.getElementById('test')%3B%20%0D%0Avar%20msg%20%3D%20document.getElementById('msg')%3B%20%0D%0Areg%20%3D%20%2F%5Cd%7C%5C.%2F%3B%20%0D%0Avar%20result%20%3D%20reg.test(keychar)%3B%20%0D%0Aif(result)%20%0D%0A%7B%20%0D%0Aif(e.keyCode%3D%3D46)%20%0D%0Aresult%3D!(txt.value.split('.').length%3E1)%3B%20%0D%0Aelse%20%0D%0Aresult%3D!(txt.value.split('.').length%3E1%26%26txt.value.split('.')%5B1%5D.length%3E1)%3B%20%0D%0A%7D%20%0D%0Aif(!result)%20%0D%0A%7B%20%0D%0Ael.className%20%3D%20%22warn%22%3B%20%0D%0Amsg.innerHTML%20%3D%20%22%E5%8F%AA%E8%83%BD%E8%BE%93%E5%85%A5%E6%95%B0%E5%AD%97%22%3B%20%0D%0Areturn%20false%3B%20%0D%0A%7D%20%0D%0Aelse%20%0D%0A%7B%20%0D%0Ael.className%20%3D%20%22%22%3B%20%0D%0Amsg.innerHTML%20%3D%20%22%22%3B%20%0D%0Areturn%20true%3B%20%0D%0A%7D%20%0D%0A%7D%20%0D%0A%3C%2Fscript%3E"> 
<div id="test"> 
只能输入数字的文本框<input type="text" name="question.page" onkeypress="return checkNumber(event,this);"> 
<span id="msg"></span> 
</div> 
</body> 
</html>

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