function win_open(str)
{
add_w = window.open(str,'ch','top='+(screen.height/2-400/2)+',left='+(screen.width/2-600/2)+',width=600,height=400,scrollbars=0,status=0,resizeable=1');
add_w.focus(); if (add_w.opener == null) { add_w.opener = window; }
}

function win_open1(str)
{
add_w = window.open(str,'ch','top='+(screen.height/2-600/2)+',left='+(screen.width/2-600/2)+',width=600,height=600,scrollbars=1,status=0,resizable=yes');
add_w.focus(); if (add_w.opener == null) { add_w.opener = window; }
}