jquery - Checkbox using Javascript -

i have created table has checkbox select, , pagination there table. problem if select 2 boxes first page , select few more in second, boxes selected in last page getting displayed , others not coming. please answer me if u aware.

here code :

function getselectedequipmentids() {         var equipmentids = "";         var checkboxs = document.getelementsbyname("instance");         ( var = 0; < checkboxs.length; i++) {             if (checkboxs[i].checked) {                 equipmentids += checkboxs[i].value + ";";             }         }         return equipmentids;     }