/**
 * @地方站窄通广告对象
 * 使用iframe形式时，调用广告页的iframe的id必须为sinaAdvIframe，一个页面中只能有一个iframe调用
 * @author 	liushuai@staff.sina.com.cn
 * @date	2010-02-11
 * @version	1.2
 * @改动
 *  1.优化了鼠标滑过切换素材时需重新加载的BUG
*/
var sinaExtAdvObj = {
	oc:null,	//初始状态容器
	ec:null,	//扩展状态容器
	mc:null,	//广告主容器
	params:{
		o:'',		//初始状态素材
		e:'',		//扩展状态素材
		t:'',		//链接地址
		ow:950,		//初始宽度
		oh:30,		//初始高度
		ew:950,		//扩展宽度
		eh:73		//扩展高度
	},
	init:function(o,e,t){
		//初始化参数
		this.params.o 			= o;
		this.params.e 			= e;
		this.params.t 			= t;

		//初始化初始状态容器
		this.oc					= document.createElement('div');
		this.oc.id				= 'oc';
		this.oc.style.position	= 'absolute';
		this.oc.style.left		= 0;
		this.oc.style.top		= 0;
		this.oc.style.zIndex	= 9;
		this.oc.style.width	 	= this.params.ow + 'px';
		this.oc.style.height 	= this.params.oh + 'px';
		this.oc.style.display	= 'block';
		this.oc.style.cursor	= 'pointer';
		this.oc.onmouseover		= this.extend;
		
		//初始化扩展状态容器
		this.ec					= document.createElement('div');
		this.ec.id				= 'ec';
		this.ec.style.position	= 'absolute';
		this.ec.style.left		= 0;
		this.ec.style.top		= 0;
		this.ec.style.zIndex	= 8;
		this.ec.style.width	 	= this.params.ew + 'px';
		this.ec.style.height 	= this.params.eh + 'px';
		this.ec.style.display	= 'block';
		this.ec.style.cursor	= 'pointer';
		this.ec.onmouseout		= this.shrink;
	},
	initObj:function(id,s,u,w,h){
		var lst = s.substring(s.length-3).toLowerCase();
		switch(lst){
		case "swf": 
			var to = document.createElement("div");
			var fo = new sinaFlash( s, id, w, h, "7", "", false, "High");
			fo.addParam("wmode", "transparent");
			fo.addParam("allowScriptAccess", "always");
			fo.addParam("menu", "false");
			fo.write(to);
			break;
		case "jpg":
		case "gif":
		case "png":
			if(u!=""){
				var to = document.createElement("a");
				to.href = u;
				to.target = "_blank";
				var io = new Image();
				io.id = id;
				io.style.width = w+"px";
				io.style.height = h+"px";
				io.style.border = "none";
				io.src = s;
				to.appendChild(io);
			}else{
				var to = new Image();
				to.id = id;
				to.style.width = w+"px";
				to.style.height = h+"px";
				to.style.border = "none";
				to.style.cursor = "pointer";
				to.src = s;	 
			}
			break;
		default:
			var to = document.createElement("a");
			to.id = id;
			to.href = u;
			to.target = "_blank";
			to.innerText = s;
		}
		return to;
	},
	extend:function(){
		this.parentNode.childNodes[0].style.zIndex	= 8;
		this.parentNode.childNodes[1].style.zIndex	= 9;
		
		this.parentNode.style.width 	= this.parentNode.childNodes[1].style.width;
		this.parentNode.style.height 	= this.parentNode.childNodes[1].style.height;
		
		if(self != top){//若广告为iframe形式，则修改iframe尺寸，此iframe的id必须为sinaAdvIframe
			top.document.getElementById('sinaAdvIframe').width 	= this.parentNode.childNodes[1].style.width;	
			top.document.getElementById('sinaAdvIframe').height = this.parentNode.childNodes[1].style.height;
		}
	},
	shrink:function(){
		this.parentNode.childNodes[0].style.zIndex	= 9;
		this.parentNode.childNodes[1].style.zIndex	= 8;

		this.parentNode.style.width 	= this.parentNode.childNodes[0].style.width;
		this.parentNode.style.height 	= this.parentNode.childNodes[0].style.height;
		
		if(self != top){
			top.document.getElementById('sinaAdvIframe').width 	= this.parentNode.childNodes[0].style.width;	
			top.document.getElementById('sinaAdvIframe').height = this.parentNode.childNodes[0].style.height;
		}
	},
	write:function(cid){
		if(document.getElementById(cid)){
			this.mc = document.getElementById(cid);
			
			//设置主容器样式
			this.mc.style.position 	= 'relative';
			this.mc.style.overflow	= 'hidden';
			this.mc.style.width		= this.oc.style.width;
			this.mc.style.height	= this.oc.style.height;
			
			var oObj = this.initObj('orialObj',this.params.o,this.params.t,this.params.ow,this.params.oh);
			var eObj = this.initObj('extendObj',this.params.e,this.params.t,this.params.ew,this.params.eh);
			this.oc.appendChild(oObj);
			this.ec.appendChild(eObj);
			
			this.mc.appendChild(this.oc);
			this.mc.appendChild(this.ec);
		}else{
			return false;	
		}
	}
}