function common_check()
{
	var m = document.getElementById("txtZKZ");
	var n = document.getElementById("txtSFZ");
  
	if (m == null || m.value == "")
	{
	    setTarget('Custom_TextBoxZKZ', '准考证不能为空！');
		return false;
	}
	
	if (m.value.length != 12)
	{
	    setTarget('Custom_TextBoxZKZ', '准考证是12位！');
		return false;
	}

	if (n != null)
	{
		if (n.value == "")
		{
			setTarget('Custom_TextBoxSFZ', '请输入身份证号！');
			return false;
		}
	}

	return true;
}