function canShowImages() {


	browser = navigator.appName;
	version = parseInt(navigator.appVersion);
	if((browser.toLowerCase()=="netscape")&&(version>2)) return true;
	if((browser.toLowerCase()=="microsoft internet explorer")&&(version>=4)) return true;
	return false;
}




function loadImage() {
        if(canShowImages()) {
		up_normal.src = "../obrazky/up_grey.gif";
		up_act.src = "../obrazky/up_red.gif";
		next_normal.src = "../obrazky/next_grey.gif";
		next_act.src = "../obrazky/next_red.gif";
		prev_normal.src = "../obrazky/prev_grey.gif";
		prev_act.src = "../obrazky/prev_red.gif";
        }
}


function activate( obr ) {
        if(canShowImages()) {
		img = eval( obr+"_act.src" );
            document [obr].src = img;
        }
}




function normal( obr ) {
        if(canShowImages()) {
                img = eval( obr+"_normal.src" );
                document [obr].src = img;
        }
}




if(canShowImages()) {


	up_normal = new Image(56,24);
	up_act = new Image(56,24);
	next_normal = new Image(24,56);
	next_act = new Image(24,56);
	prev_normal = new Image(24,56);
	prev_act = new Image(24,56);


	loadImage(); 
}




defaultStatus='';