var actualImage = new String("but6");
var oldImage = new String("but6");

var actual = new String("but6");
var old = new String("but6");

if (document.images) {

        var but1on = new Image();
        but1on.src = "../img/nav1a.gif";
        var but1off = new Image();
        but1off.src = "../img/nav1.gif";

        var but2on = new Image();
        but2on.src = "../img/nav2a.gif";
        var but2off = new Image();
        but2off.src = "../img/nav2.gif";

        var but3on = new Image();
        but3on.src = "../img/nav3a.gif";
        var but3off = new Image();
        but3off.src = "../img/nav3.gif";
		
		var but4on = new Image();
        but4on.src = "../img/nav4a.gif";
        var but4off = new Image();
        but4off.src = "../img/nav4.gif";
		
        var but5on = new Image();
        but5on.src = "../img/nav5a.gif";
        var but5off = new Image();
        but5off.src = "../img/nav5.gif";
		
        var but6on = new Image();
        but6on.src = "../img/nav6a.gif";
        var but6off = new Image();
        but6off.src = "../img/nav6.gif";
		
        var but7on = new Image();
        but7on.src = "../img/nav7a.gif";
        var but7off = new Image();
        but7off.src = "../img/nav7.gif";

        var but8on = new Image();
        but8on.src = "../img/nav8a.gif";
        var but8off = new Image();
        but8off.src = "../img/nav8.gif";

        var but9on = new Image();
        but9on.src = "../img/nav9a.gif";
        var but9off = new Image();
        but9off.src = "../img/nav9.gif";

        var but10on = new Image();
        but10on.src = "../img/nav10a.gif";
        var but10off = new Image();
        but10off.src = "../img/nav10.gif";
}

function change2(URL1,F1,URL2,F2) {  
		parent.frames[F1].location.href=URL1;
		parent.frames[F2].location.href=URL2;
}


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

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

function img_set(imgName) {
        if(document.images) {
                oldImage = actualImage;
                actualImage = imgName;
                img_inact(oldImage);
                img_act(actualImage);
        }
}