function clickIE4(){
	if (event.button==2) return false;
}

function clickNS4(e){
	if (document.layers||document.getElementById&&!document.all)
		if (e.which==2||e.which==3) return false;
}

if (document.layers){
	document.captureEvents(Event.MOUSEDOWN);
	document.onmousedown=clickNS4;
}
else if (document.all&&!document.getElementById){
	document.onmousedown=clickIE4;
}

document.oncontextmenu=new Function("return false;")