//函数功能：搜索等待时显示
//txt 显示的文字
//w 宽度
//img 是src的路径
function showwaitbar(txt,w,img)
{
	 	//遮罩背景设置 
		var sWidth,sHeight; 
		sWidth = screen.availWidth; 
		sHeight = document.body.scrollHeight; 
		//创建遮罩背景 
		var maskObj = document.createElement("div"); 
		maskObj.setAttribute('id','maskdiv'); 
		maskObj.style.position = "absolute"; 
		maskObj.style.top = "0"; 
		maskObj.style.left = "0"; 
		maskObj.style.background = "#777"; 
		maskObj.style.filter = "Alpha(opacity=30);"; 
		maskObj.style.opacity = "0.3"; 
		maskObj.style.width = sWidth + "px"; 
		maskObj.style.height = sHeight + "px"; 
		maskObj.style.zIndex = "99"; 
		document.body.appendChild(maskObj); 
		con  = "<div style=\"text-align:center;margin:2px 2px 2px 2px;padding:20px; width:"+(w-45)+"px; height:70px; border:1px #888 solid; text-align:center; font-size:14px;font-weight: bold;\">";
        con += "<div style=\"text-align:center\">"+ txt +"</div>";
        con += "<div style=\"text-align:center\"><img id=\"loadingimg1\" src=\""+ img + "\" alt=\"Loading...\" /></div>";
      	con += "</div>";
      	var cw=(document.documentElement.clientWidth-w)/2+document.documentElement.scrollLeft;
		var ch=(document.documentElement.clientHeight)/2+document.documentElement.scrollTop;
		
		
		
		
		var divdisp = document.createElement("div");
		divdisp.setAttribute('id','flashAd');
		divdisp.style.width = w+"px";
		divdisp.style.left=cw+"px";
		divdisp.style.top=ch+"px";
		divdisp.style.float ="left";
		divdisp.style.zIndex=100;
		divdisp.style.background = "#CCCCCC"; 
        divdisp.style.position='absolute';
        //alert(document.documentElement.clientWidth);
		//插入生成的div内容
		divdisp.innerHTML = con;
		document.body.appendChild(divdisp);	
		//修改下图片 解决不能加载图片问题
		var chgloadingimg = document.getElementById("loadingimg1");
		chgloadingimg.src= img ;
		//在读一次 解决gif不能动问题
		var chgdiv = document.getElementById("flashAd");
		chgdiv.innerHTML = con;
		
}