function Collection(){var a=new Array();var b=0;this.add=function(c){a.push(c)};this.remove=function(c){var d=0;for(var e=a[d];e!=null;e=a[d=d+1]){if(e==c){a.splice(d,1)}}};this.first=function(){b=0;if(this.count()>0){return a[b]}};this.next=function(){b=b+1;if(this.count()>0){return a[b]}};this.last=function(){if(this.count()>0){return a[a.length-1]}};this.clear=function(){a=new Array()};this.count=function(){return a.length};this.join=function(c){return a.join(c)};this.items=function(e){var c=0;for(var d=a[c];d!=null;d=a[c=c+1]){if(d==e){return d}else{if(d.id==e){return d}else{if(d.clientid==e){return d}}}}return a[e]}};