document.onselectstart=new Function('return false');
function md(e){return false;}
function dc(){return true;}
document.onmousedown=md;
document.onclick=dc;
function checkkey(e)
{ 
ns4 = (document.layers)? true:false
ie4 = (document.all)? true:false
var key;
if(ie4)
key=window.event.keyCode;
else
key=e.which;
if(key == 17)
{
alert('Control key is disabled.');
event.returnValue = false;
return false;
}

}