function select_all(gField)
{
	if (gField.length == null) { /* Un seul element */			 
		gField.checked = true;
	} else {
		for (var i=0;i<gField.length;i++)
			gField[i].checked = true;
	}
	
}

function select_none(gField)
{
	if (gField.length == null) { /* Un seul element */			 
		gField.checked = false;
	} else {
		for (var i=0;i<gField.length;i++)
			gField[i].checked = false;
	}
	
}

function Effacer_Input(Object) {
	if (Object.value == Object.defaultValue) {
		Object.value = '';
		Object.style.fontStyle = 'normal'
	}
}

function Afficher_Input(Object) {
	if (Object.value == '') {
		Object.value = Object.defaultValue;
		Object.style.fontStyle = 'italic';
	}
}