var oLastBtn=0,bIsMenu=false 
if (window.Event)
{
document.captureEvents(Event.MOUSEUP); 
}

function nocontextmenu()
{ 
event.cancelBubble=true;
event.returnValue=false; 
return false; 
}

function norightclick(e) 

{ 
if(window.Event) 
{ 
if (e.which !=1)
{
return false; 
}
} 
else 
if(event.button!=1) 
{ 
event.cancelBubble=true;
event.returnValue=false; 
return false; 
} 
}

document.oncontextmenu=nocontextmenu; 
document.onmousedown=norightclick; 

function onKeyDown()
{
if ((event.altKey)||((event.keyCode==8)&&(event.srcElement.type!="text"&&event.srcElement.type!="textarea"&&event.srcElement.type!="password"))||((event.ctrlKey)&&((event.keyCode==78)||(event.keyCode==82)))||(event.keyCode==116))
{
event.keyCode=0;
event.returnValue=false;
}
}

function presskey(eventobject){
if (event.ctrlKey && window.event.keyCode==65)
alert('请尊重知识产权');
}