Make Editable All Obj With An Id Not Just One

I've got this prototype funtion

function makeEditable(id){
Event.observe(id, 'click', function(){edit($(id))}, false);
Event.observe(id, 'mouseover', function(){showAsEditable($(id))}, false);
Event.observe(id, 'mouseout', function(){showAsEditable($(id), true)}, false);
}

that make editable a <p id=xxx> with an speial id I want to modify it to makeditable any of <p> with that id if it's been clicked and also i use this function on a button how I can avoid this function from multiple executing by multiple clicking by user?