var gPopWin;

function popUp() {

gPopWin=window.open("","product_win","toolbar=0,location=0,directories=0,status=1,menubar=0,scrollbars=0,resizable=0,width=300,height=300");

gPopWin.focus();

}
     
function closeWinIfOpen(){if(gPopWin){gPopWin.window.close();}}