/**
 * @author Eric Jouffrey
 */
function clearField($idField,$initialText){
	var object = document.getElementById($idField);
	if( object.value==$initialText ){
		object.value="";
	}
}
function displayArea($idArea){
	var object = document.getElementById($idArea);
	object.style.display="block";
}
function hideArea($idArea){
	var object = document.getElementById($idArea);
	object.style.display="none";
}
function toggleArea($idArea){
	var object = document.getElementById($idArea);
	if(object.style.display=="block"){
		hideArea($idArea);
	}
	else{
		displayArea($idArea);
		}
}