function clickIE(){
	if (document.all)return false;
}
function clickNS(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=clickNS;
}else{
	document.onmouseup=clickNS;
	document.oncontextmenu=clickIE;
}
document.oncontextmenu=new Function("return false")