isMac = (navigator.appVersion.indexOf("Mac")!=-1) ? true : false;
NS4=(document.layers) ? true : false;
IE4=(document.all && !isMac) ?true:false;
ver4 = (NS4 || IE4) ? true : false;

if (NS4 || IE4)
{
arImLoad = new Array ( "niisi", "director", "admin", "struct", "print", "devel", "person" );



arImList1 = new Array ();
arImList2 = new Array ();

for (i=0; i < arImLoad.length; i++ )
     {
     arImList1[i] = new Image();
     arImList1[i].src = arImLoad[i] + ".gif";
     arImList2[i] = new Image();
     arImList2[i].src = arImLoad[i] + "_" + ".gif";
     }
}

function highlight(imageName,bTgl)
{
if (document.images)
{
//     if (cur != imageName)
//     {
        if (bTgl)
        {       document.images[imageName].src = imageName + "_" + ".gif"; }
        else
        {       document.images[imageName].src = imageName + ".gif"; }
//     }
}

}