function win1() {
    window.open("win1.htm","Window1","menubar=no,width=400,height=200,toolbar=no");
}
 
function win2() {
    window.open("win2.htm", "Window2", "menubar=no,width=400,height=200,toolbar=no");
}

function win4() {
    window.open("win4.htm", "Window2", "menubar=no,width=300,height=500,toolbar=no");
}
 
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");
}

function win6() {
    window.open("win6.htm","Window1","menubar=no,width=400,height=200,toolbar=no");
}