function NSclick(e) {
	if (navigator.appName == "Netscape" && parseInt(navigator.appVersion) == 4) { 
		if (e.which == 3) {
			return false;
		}
	}
	if (navigator.appName == "Netscape" && parseInt(navigator.appVersion) >= 5) { 
    		if (e.button == 2 || e.button == 3) {
      			e.preventDefault();
			return false;
  		}
	}
}

if (navigator.appName == "Netscape" && parseInt(navigator.appVersion)==4) { 
	document.onmousedown = NSclick;
	document.captureEvents(Event.MOUSEDOWN);
}
if (navigator.appName == "Netscape" && parseInt(navigator.appVersion)>=5) { 
	document.onmouseup = NSclick;
}
if (navigator.appName == "Microsoft Internet Explorer") { 
	document.oncontextmenu = new Function("return false;")
}