function selectstart()      
{
	event.returnValue=false;
}

function mousedown() 
{
	if (event.button==2)
	{
	  event.returnValue=false;
	}
}

function keydown()
{
	if (event.ctrlKey)
	{
		event.returnValue=false;
	}
}

document.onselectstart=selectstart;
document.onmousedown=mousedown;
document.onkeydown=keydown;

if(window.attachEvent)
{
    window.attachEvent("onload",onloadEvent);
}
else
{
    window.addEventListener("load",onloadEvent,false);
}

function onloadEvent()
{
    document.body.oncopy=function()
    { 
       event.returnValue = false;
       clipboardData.clearData();
    }
}