function add_dashed_ling_among_category(id , num){
	var myDiv=document.getElementById(id).getElementsByTagName("div");
	myDiv[num].style.cssText="margin-bottom:4px;padding-bottom:3px;border-bottom:1px #c2daf3 dashed";
	}

//������ַ����� ����֮�� �� ��
function add_dashed_line(div_id){
		add_dashed_ling_among_category(div_id , 2);
		add_dashed_ling_among_category(div_id , 6);
		add_dashed_ling_among_category(div_id , 9);

}
/*
function getIFrameDOM(id){//����IE��Firefox��iframe DOM��ȡ����
    return document.getElementById(id).contentDocument || document.frames[id].document;
}

alert(16);
 var  iFrame=document.getElementById('hotel_plane_iframe').contentWindow;
var iFrame=getIFrameDOM("hotel_plane_iframe");

iFrame.document.designMode = 'on';
iFrame.document.contentEditable = true;

alert(17);
var tap=iFrame.getElementById("hotel_plane");
alert(20);
alert(tap);
alert(iFrame.getElementsByTagName("li").length);
tap.style.background = "red";
alert(tap);
// JavaScript Document
*/