function InputNum(obj)
	{
		if(event.keyCode >= 48 && event.keyCode <=57 ||event.keyCode ==8 || event.keyCode >= 96 && event.keyCode <=105) 
		{
			return true;
		}
		return false;
	}

	function checkKey(key,str,em)
	{
		var o = key;
		if(o.value == "" || o.value == null)
		{
			if(str != null)
				alert(str);
			else
				alert("請(qǐng)輸入關(guān)鍵字！");
			return false;
		}
		else if(isNull(o.value))
		{
			if(em != null)
				alert(em);
			else
				alert("關(guān)鍵字不能為空！");
			return false;
		}
		else
		{
			return true;
		}
	}
	
	function isNull(str)
	{
		var len = '';
		for(i = 0; i < str.length; i++) 
		{
			len = len + ' ';
		}
		return (len == str);
	}