hola alguien me ayuda porfa nesecito un codigo

<script language="Javascript">
<!-- Begin
function disableselect(e){
return false
}
function reEnable(){
return true
}
document.onselectstart=new Function ("return false")
if (window.sidebar){
document.onmousedown=disableselect
document.onclick=reEnable
}
// End -->
</script>