var BrowserName = navigator.appName;
var BrowserVers = parseInt(navigator.appVersion);

function show_arrow(imgDocID1,visible) {
	if ((BrowserName == 'Netscape' && BrowserVers >= 3)||
    	(BrowserName == 'Microsoft Internet Explorer' && BrowserVers >= 4)){			
		
		if (visible == 'on') {
		document.images[imgDocID1].src = "http://www.wuw-online.de/images/arrow_r.gif";
		}                               // of if
		if (visible == 'off') {
		document.images[imgDocID1].src = "http://www.wuw-online.de/images/pix_trans.gif";
		}                               // of if
	}                                   // of if
}                                       // of function

function show_arrow_left(imgDocID1,visible) {
	if ((BrowserName == 'Netscape' && BrowserVers >= 3)||
    	(BrowserName == 'Microsoft Internet Explorer' && BrowserVers >= 4)){			
		
		if (visible == 'on') {
		document.images[imgDocID1].src = "http://www.wuw-online.de/images/arrow_l.gif";
		}                               // of if
		if (visible == 'off') {
		document.images[imgDocID1].src = "http://www.wuw-online.de/images/pix_trans.gif";
		}                               // of if
	}                                   // of if
}                                       // of function