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$('div').attr('unselectable', 'on').select(function() {return false}).css({
  '-moz-user-select': '-moz-none',
  '-o-user-select': 'none',
  '-khtml-user-select': 'none',
  '-webkit-user-select': 'none',
  'user-select': 'none'
});

function returnFalse(e){
  return false;
}
 
function cancelEvent(e){
  if(e.preventDefault)e.preventDefault();
  else e.returnValue=false;
}
 
function addHandler(e,event,action,param){
  if(document.addEventListener)e.addEventListener(event,action,param);
  else if(document.attachEvent)e.attachEvent('on'+event,action);
  else e['on'+event]=action;
}
 
function removeHandler(e,event,action,param){
  if(document.addEventListener)e.removeEventListener(event,action,param);
  else if(document.attachEvent)e.detachEvent('on'+event,action);
  else e['on'+event]=returnFalse;
}
 
addHandler(document,'mousedown',mouseDown,false);
addHandler(document,'mouseup',mouseUp,false);
 
function mouseDown(e){
  e=e||event;
  cancelEvent(e);
  addHandler(document,'selectstart',returnFalse,false);
}
 
function mouseUp(e){
  removeHandler(document,'selectstart',returnFalse,false);
}