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 //**********************************************************************************
      //this function can remove a array element.
            Array.remove = function(array, from, to) {
                var rest = array.slice((to || from) + 1 || array.length);
                array.length = from < 0 ? array.length + from : from;
                return array.push.apply(array, rest);
            };
       
            //this variable represents the total number of popups can be displayed according to the viewport width
            var total_popups = 0;
           
            //arrays of popups ids
            var popups = [];
       
            //this is used to close a popup
            function close_popup(id)
            {
                for(var iii = 0; iii < popups.length; iii++)
                {
                    if(id == popups[iii])
                    {
                        Array.remove(popups, iii);
                       
                        document.getElementById(id).style.display = "none";
                        
                         $.post("" + baseUrl +"/chatcontroller/del_channal",
                         {
                             Dest:id,
                         }, function (data) {       
                            alert(data);
                         });
                        
                        
                        $( ".popup-box" ).remove();
                      
                        calculate_popups();
                       
                        return;
                    }
                }  
            }
       
            //displays the popups. Displays based on the maximum number of popups that can be displayed on the current viewport width
            function display_popups()
            {
                var right = 230;
               
                var iii = 0;
                for(iii; iii < total_popups; iii++)
                {
                    if(popups[iii] != undefined)
                    {
                        var element = document.getElementById(popups[iii]);
                        element.style.right = right + "px";
                        right = right + 270;
                        element.style.display = "block";
                    }
                }
               
                for(var jjj = iii; jjj < popups.length; jjj++)
                {
                    var element = document.getElementById(popups[jjj]);
                    element.style.display = "none";
                }
            }
            
          
            function register_popup(id, name)
            {
               //alert(baseUrl);
                for(var iii = 0; iii < popups.length; iii++)
                {  
                    //already registered. Bring it to front.
                    if(id == popups[iii])
                    {
                        Array.remove(popups, iii);
                   
                        popups.unshift(id);
                       
                        calculate_popups();
                       
                        return;
                    }
                }
                
                                
                 $.post("" + baseUrl +"/chatcontroller/msgbox_show",
                { 
                     Dest: id ,                    
                },
                  function(data){
           
                  var element = '<div class="popup-box" id="'+ id +'" >';
                  element = element + '<div class="popup-head">';
                  element = element + '<div class="popup-head-left">'+ name +'</div>';
                  element = element + '<div class="popup-head-right"><a href="javascript:close_popup(\''+ id +'\');">&#10005;</a></div>';
                  element = element + '<div style="clear: both"></div></div>';
                  element = element + '<div class="popup-content-text" id="popup-content-text">';  
                  element = element + '</div>'; 
                  element = element + '\n\<div class="popup-messages"><textarea class="Message-popup" id="Message-popup" rows="1" cols="1" onkeyup="javascript:Msg_box_save(\''+ id +'\',event);"></textarea></div>';
                  element = element + '</div>';
                  
                  document.getElementsByTagName("body")[0].innerHTML = document.getElementsByTagName("body")[0].innerHTML + element; 
                  popups.unshift(id);
              
                  calculate_popups(); 
                  var rs = $.parseJSON(data);
            
                      for( var i=0; i<rs.length; i++){
                       $(".popup-content-text").append(rs[i].msg_user + " : " + rs[i].msg_message + "<br>");
                      }
                      
               }); 
    }  
                   
             
           
           
           function Msg_box_save(id,e){
                 if((e.keyCode)=="13"){
                 $.post("" + baseUrl +"/chatcontroller/msgbox_add",
                  {
                    txtDest:id,
                    txtMsg:$(".Message-popup").val(),
                  },
                  function(data){
                  $(".Message-popup").val("");
                  });  
                 }
           }
           
            //calculate the total number of popups suitable and then populate the toatal_popups variable.
            function calculate_popups()
            {
                var width = window.innerWidth;
                if(width < 540)
                {
                    total_popups = 0;
                }
                else
                {
                    width = width - 200;
                    //320 is width of a single popup box
                    total_popups = parseInt(width/320);
                }
               
                display_popups();
               
            }
           
            //recalculate when window is loaded and also when window is resized.
            window.addEventListener("resize", calculate_popups);
            window.addEventListener("load", calculate_popups);