function alertWin(title, msg, w, h)
{ 
    var titleheight = "22px"; // alert window title height 
    var bordercolor = "#666699"; // alert window border color 
    var titlecolor = "#FFFFFF"; // alert window title color 
    var titlebgcolor = "#666699"; // alert window title color
    var bgcolor = "#FFFFFF"; // alert content bg color 
    
    var iWidth = document.documentElement.clientWidth; 
    var iHeight = document.documentElement.clientHeight; 
    var bgObj = document.createElement("div"); //add bg color,add div on all html, and disable user click on other place
    bgObj.style.cssText = "position:absolute;left:0px;top:0px;width:"+iWidth+"px;height:"+Math.max(document.body.clientHeight, iHeight)+"px;filter:Alpha(Opacity=30);opacity:0.3;background-color:#000000;z-index:101;";
	bgObj.id='gray_bg';
    document.body.appendChild(bgObj); 
    
    var msgObj=document.createElement("div");//add alert window
    msgObj.style.cssText = "position:absolute;font:11px 'Arial';top:"+(iHeight-h)/2+"px;left:"+(iWidth-w)/2+"px;width:"+w+"px;height:"+h+"px;text-align:center;border:1px solid "+bordercolor+";background-color:"+bgcolor+";padding:1px;line-height:22px;z-index:102;";
	msgObj.id = 'chat_win';
    document.body.appendChild(msgObj);
    
    var table = document.createElement("table");
    msgObj.appendChild(table);
    table.style.cssText = "margin:0px;border:0px;padding:0px;";
    table.cellSpacing = 0;

    var tr = table.insertRow(-1);
    var titleBar = tr.insertCell(-1);//add  window  title tr
    titleBar.style.cssText = "width:"+w+"px;height:"+titleheight+"px;text-align:left;padding:0px;margin:0px;font:bold 13px 'Arial';color:"+titlecolor+";border:1px solid " + bordercolor + ";cursor:move;background-color:" + titlebgcolor;
    titleBar.style.paddingLeft = "0px";
    titleBar.innerHTML = '  '+title;
    var moveX = 0;
    var moveY = 0;
    var moveTop = 0;
    var moveLeft = 0;
    var moveable = false;
    var docMouseMoveEvent = document.onmousemove;
    var docMouseUpEvent = document.onmouseup;
    titleBar.onmousedown = function()
    {
        var evt = getEvent();
        moveable = true; 
        moveX = evt.clientX;//moveX¡¢moveY mouse click£¬moveTop,moveLeft for window x,y
        moveY = evt.clientY;
        moveTop = parseInt(msgObj.style.top);
        moveLeft = parseInt(msgObj.style.left);
        document.onmousemove = function() 
        {
            if (moveable) 
            {
                var evt = getEvent();
                var x = moveLeft + evt.clientX - moveX;//(evt.clientX - moveX) for mouse x,y 
                var y = moveTop + evt.clientY - moveY;
                if ( x > 0 &&( x + w < iWidth - 3) && y > 0 && (y + h < iHeight - 3) ) //contral window can not out of order
                {
                    msgObj.style.left = x + "px";
                    msgObj.style.top = y + "px";
                }
            }    
        };
        document.onmouseup = function () 
        { 
            if (moveable) 
            { 
                document.onmousemove = docMouseMoveEvent;
                document.onmouseup = docMouseUpEvent;
                moveable = false; 
                moveX = 0;
                moveY = 0;
                moveTop = 0;
                moveLeft = 0;
            } 
        };
    }

    var closeBtn = tr.insertCell(-1);//add close
    closeBtn.style.cssText = "cursor:pointer; padding:2px;text-align:right;background-color:" + titlebgcolor;
    closeBtn.innerHTML = "<span style='font-size:15pt; color:"+titlecolor+";'>x</span>";
    closeBtn.onclick = function()
    { 
					//remove flash
					chating ='NO';
					var flash=getFlashMovieObject('msg_box');
         			flash.CloseWindow(); 
					swfobject.removeSWF("msg_box");  
					window.onbeforeunload=null;
					
					document.body.removeChild(bgObj); 
					document.body.removeChild(msgObj);
					if (video_chat_connect=='YES')
					{
						chat_report();
					}
    } 
    
	
	var tr2 = table.insertRow(-1).insertCell(-1);//add msg 
	tr2.style.cssText = "font:10pt 'Arial';";
	tr2.colSpan  = 2;
	//add a table here 
	var table_2 = document.createElement("table");
    tr2.appendChild(table_2);
    table_2.style.cssText = "margin:0px;border:0px;padding:0px;";
    table_2.cellSpacing = 0;

	var table_2_tr = table_2.insertRow(-1);
	var msgBox = table_2_tr.insertCell(-1);//add flash 
    msgBox.style.cssText = "font:10pt 'Arial';";
    msgBox.colSpan  = 2;
    msgBox.innerHTML = '<div id="msg_box">'+msg+'</div>';

	var giftBox = table_2_tr.insertCell(-1);//add gift 
	giftBox.innerHTML = '<div id="gift_box"></div>';

	if(msg=='watch_broadcast')
	{
		var giftBox = table_2_tr.insertCell(-1);//add user 
		giftBox.innerHTML = '<div id="user_list_area" style="width: 175px; height: 490px;border-color: black;border-style: solid;border-width: 1px;overflow:auto;font-family:Arial;font-size:12px;" align="center">User list</div>';
	}
		
	window.onbeforeunload=function(event)
    {
        event = event || window.event;
        event.returnValue = "Chat window will be closed, are you sure?";
    }
    
    function getEvent() 
    {
        return window.event || arguments.callee.caller.arguments[0];
    }
}