function openChatPopup(URL,width,height,posx,posy){
        if (width=='') width=400;
        if (height=='') height=300;
        if (posx=='') posx=100;
        if (posy=='') posy=50;
        var myparams='width='+width+',height='+height+',left='+posx+',top='+posy+',scrollbars=0,status=0,titlebar=0,location=0';
        var popup = window.open(URL , 'link', myparams);
}