ns4 = (document.layers)? true:false;
ie4 = (document.all)? true:false;

var allume = 1;

function change(element) {

var emplacement = 'allume_' + element;
allume == emplacement;

	if ( allume == 1 ) {
		if (ns4) {
			eval('document.' + element).visibility = 'hidden';
			allume = 0;
			}
		if (ie4) {
			eval(element).style.visibility = 'hidden';
			allume = 0;
			}
		}
	else {
		if (ns4) {
			eval('document.' + element).visibility = 'visible';
			allume = 1;
			}
		if (ie4) {
			eval(element).style.visibility = 'visible';
			allume = 1;
			}
		}
	}