Adding data from Multiple Arrays

Hi,

How can I extend one array from 2 or more, for example:

First:

   var ivcFilters = [];     ivcFilters[0] = new nlobjSearchFilter('item', null, 'anyof', '53');   ivcFilters[1] = new nlobjSearchFilter('trandate',null,'onorafter','09/01/09');        var ivcColumns = [];  ivcColumns[0] = new nlobjSearchColumn('internalid', null, null);  ivcColumns[1] = new nlobjSearchColumn('type',null,null);  ivcColumns[2] = new nlobjSearchColumn('tranid', null, null);  ivcColumns[3] = new nlobjSearchColumn('trandate', null, null);           var itemivcSearch = new Array();  itemivcSearch = nlapiSearchRecord('invoice',null,ivcFilters,ivcColumns); 

second:

   var assbuildFilters = [];     assbuildFilters[0] = new nlobjSearchFilter('item', null, 'anyof', '53');     itemivcSearch Array is the first, the second would be:        var assbuildColumns = [];     assbuildColumns[0] = new nlobjSearchColumn('type', null, null);  assbuildColumns[1] = new nlobjSearchColumn('tranid', null, null);  assbuildColumns[2] = new nlobjSearchColumn('trandate', null, null);  assbuildColumns[3] = new nlobjSearchColumn('serialnumbers', null, null);  assbuildColumns[4] = new nlobjSearchColumn('quantity', null, null);  assbuildColumns[5] = new nlobjSearchColumn('item', null, null);        var assbuildSearch = new Array();  assbuildSearch = nlapiSearchRecord('assemblybuild', null, assbuildFilters, assbuildColumns);