var E = YAHOO.util.Event;

            //definition of containers ID's

            var available_container = 'available_members';

            var selected_container = 'users_group_members';

            //form containing containers id

            var form_id = 'edit_users_group';

            //temp container for selected storage.

            var cache = new Array();

            var av_cache = new Array();

            var c =  D.get(selected_container);

            var ac = D.get(available_container);

            //get only selected options for further fullfilment

            for(var i = 0;node =c.options[i];i++){

                if(node.selected){

                    //push selected to my temp storage left overs :)

                    cache.push(node);

                }

            }

            //clear 'selected' select

            //fill it with remembered options

            //get all available options to cache

            for(var i = 0;node =ac.options[i];i++){

                    //push selected to my temp storage left overs :)

                    av_cache.push(node);

            }            

            //fill available only with those not in choosen

            ac.options.length=0;

            tmp_cache = new Array();

            for(var i = 0;node = av_cache[i];i++){

            	var add = true;

	            for(var i2 = 0;node_2 = cache[i2];i2++){

	                if(node.value == node_2.value){

	                	add=false;

	                	break;

	                }

	            }

	            if(add){

	            	tmp_cache.push(new Option(node.text, node.value, false, false));

	            }

            }