<!-- on/off leftmnu begin -->

function imgCh1(img1name, img1src)
{ if (document.images)
{ document[img1name].src = img1src;
}}

function imgOn(imgName) {
 if (document.images) { document[imgName].src = eval(imgName + "on.src"); }
}

function imgOff(imgName) {
 if (document.images) { document[imgName].src = eval(imgName + "off.src"); }
}

<!-- on/off leftmenuend -->

<!-- pop-up 600 px begin -->

function Preview(id) {

SmallWin=window.open('' + id,
"SmallWin",
"toolbar=no,directories=no,status=no,scrollbars=yes,menubar=no,width=650,height=600"
);
        SmallWin.window.focus()
}

function popUp(URL) {

day = new Date();
id = day.getTime();
eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=0');");
}
<!-- pop-up 600 px end -->