function openPopWin(id){
	//获取可视区域宽高
	//window.onscroll = function(){openPopWin(id)};
	var de=document.documentElement;
	var db=document.body;
	
	var scrollTop = document.documentElement.scrollTop|| document.body.scrollTop;
	var scrollLeft = document.documentElement.scrollLeft|| document.body.scrollLeft;
	
	var viewW=de.clientWidth||db.clientWidth;
	var viewH=de.clientHeight||db.clientHeight;
	var iframe = document.createElement("iframe")
	var div = document.createElement("div")
	div.id = "divWrap"
	$(div).height(Math.max(de.scrollHeight, de.clientHeight));
	$(div).width("100%");
	$(div).css({background:"#000000",position:"absolute",opacity:"0.5",left:"0",top:"0",'z-index':"9"});
	$(iframe).css({position:"absolute",left:"0",top:"0",'z-index':"-1",border:"none",width:"100%",height:"100%"});
	$(iframe).appendTo(div); 
	db.insertBefore(div, db.childNodes[0]);
	var objW = $("#"+id).width();
	var objH = $("#"+id).height();
	var range = 5;//修正
	$("#"+id).css({top:(scrollTop+(viewH-parseInt(objH,10)-range)/2)+"px",left:(scrollLeft+(viewW-parseInt(objW,10)+range)/2)+"px",display:"block",position: "absolute",'z-index':"99"});
	//$("#"+id).css({left:(viewW/2-(parseInt(objW,10)/2))+"px",top:(viewH/2-(parseInt(objH,10)/2))+"px",display:"block",position: "absolute",'z-index':"99"});
}
function closePopWin(id){
	$("#divWrap").remove();
	$("#"+id).css("display","none");
}