function win1() {
    window.open("tou.html","Window1","menubar=no,width=610,height=400,toolbar=no,scrollbars=yes");
}

function openWin2() {
    win2 = window.open("win2.php", "Window2",
    "width=310,height=600,scrollbars=yes");
}

function openWin3() {
    win3 = window.open("", "Window3", "width=320,height=210,scrollbars=yes");
}

function writeTo3() {
    win3.document.writeln("<h2>This is written to Window 3 by the main window</h2>");

}

function openWinNav() {
    win2 = window.open("winnav.php", "Navigation","width=200,height=300,scrollbars=no,status=no");
}