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');