How to open a window using Javascript

function window_open() 
{
var PopupWindow=null;
PopupWindow=window.open("frmLoginDefault.aspx","window2","width=1017px,height=693px,status=1,resizable=0,scrollbars=yes,menubar=no,top=0,left=0");
       PopupWindow.focus();
       closeWin();

}