<a href="winNameA.htm" onClick="createWindow('');" target="winA">winNameA.htm</a>
win = null; features = 'width=200,height=100,resizable'; function createWindow(url){ if(win==null || win.closed) win=window.open(url,'winA',features); }
<a href="javascript:void(0);" onClick="createWindow('');return false;">open window</a> <a href="winNameA.htm" target="winA">load winNameA.htm</a>