var iversion = -1;
var roll=false;

function version() {
    if (iversion != -1) return roll;

        if (navigator.appName.indexOf("Netscape") != -1) { // Netscape
                if (navigator.userAgent.indexOf("Mozilla/") != -1)
                        iversion = parseFloat(navigator.appVersion)
                else
                        iversion = 1;
                roll = (iversion>=3);
        } else {  // Not netscape.
                if (navigator.appName.indexOf("Internet Explorer") != -1) {
                        if (navigator.userAgent.indexOf("Mozilla/") != -1) 
                                iversion = parseFloat(navigator.appVersion)
                        else
                                iversion = 1;
                } else {
                        iversion = 1;
                }
                roll = (iversion>3);
        }
        return roll;
}

if (version()) {
            but1        = new Image(100,300);
            but2        = new Image(100,300);
            but3        = new Image(100,300);
            but4        = new Image(100,300);
            but5        = new Image(100,300);
            but6        = new Image(100,300);
	    but7        = new Image(100,300);
            but1.src    = "mappen/plaatjes/menu0.jpg";
            but2.src    = "mappen/plaatjes/menu1.jpg";
            but3.src    = "mappen/plaatjes/menu2.jpg";
            but4.src    = "mappen/plaatjes/menu3.jpg";
            but5.src    = "mappen/plaatjes/menu4.jpg";
            but6.src    = "mappen/plaatjes/menu5.jpg";
            but7.src    = "mappen/plaatjes/menu0.jpg";
                                                
           }
function chimg(pic,name) {
                if (roll) {
                        pic.src = name.src;
                } 
}