var listItems = new Array(); function addToList(id, desc){ var listEntry = {id: id, desc: desc}; listItems.push(listEntry); } function openList(){ var arrayLength = listItems.length; var url = "/u/" for (var i = 0; i < arrayLength; i++) { if (i != 0) { url = url + "," } url = url + listItems[i]["id"] } window.open(url) } $("#btnOpenAsList").click(function (evt) { openList(); });