document.oncontextmenu = function(){return false}
            // IE Evitar seleccion de texto
            document.onselectstart=function(){
                if (event.srcElement.type != "text" && event.srcElement.type != "textarea" && event.srcElement.type != "password")
                    return false
                else return true;
              };

  if (window.sidebar){
document.onmousedown=function(e){
var obj=e.target;
if (obj.tagName.toUpperCase() == "INPUT" || obj.tagName.toUpperCase() == "TEXTAREA" || obj.tagName.toUpperCase() == "PASSWORD")
return true;
else
return false;
}
  }