function _selectstart() 
{
	event.returnValue=true;
}

function _mousedown()
{
	if (event.button==2)
	{
	    alert("该网页禁止复制，敬请原谅！");
		event.returnValue=false;
	}
}

function _ctrlKeyDown()
{   
	if (event.ctrlKey)
	{
		event.returnValue=false;
	}
}
document.body.onkeydown=_ctrlKeyDown;
document.body.onselectstart=_selectstart;
document.body.onmousedown=_mousedown;