// JavaScript Document

function custom_print() { // version nettement simplifiee
	window.print();
}

function goHist(a) 
{
   history.go(a);     
}

function zoom(id_layer) {
	if (id_layer != '') zoomLayer(id_layer);
}

function unzoomAll() {
	document.getElementById('A').style.display = "none";
	document.getElementById('B').style.display = "none";
	document.getElementById('C').style.display = "none";
	document.getElementById('D').style.display = "none";
	document.getElementById('E').style.display = "none";
	document.getElementById('F').style.display = "none";
	document.getElementById('G').style.display = "none";
	document.getElementById('H').style.display = "none";
	document.getElementById('I').style.display = "none";
	document.getElementById('J').style.display = "none";
	document.getElementById('K').style.display = "none";
	document.getElementById('L').style.display = "none";
	document.getElementById('M').style.display = "none";
	document.getElementById('N').style.display = "none";
	document.getElementById('O').style.display = "none";
	document.getElementById('P').style.display = "none";
	document.getElementById('Q').style.display = "none";
	document.getElementById('R').style.display = "none";
	document.getElementById('S').style.display = "none";
	document.getElementById('T').style.display = "none";
	document.getElementById('U').style.display = "none";
	document.getElementById('V').style.display = "none";
	document.getElementById('W').style.display = "none";
	document.getElementById('X').style.display = "none";
	document.getElementById('Y').style.display = "none";
	document.getElementById('Z').style.display = "none";
}


function zoomLayer(id_layer) {
	
	unzoomAll();
	
	
	var item = null;
	if (document.getElementById) {
		item = document.getElementById(id_layer);
	} else if (document.all){
		item = document.all[id_layer];
	} else if (document.layers){
		item = document.layers[id_layer];
	}
	
	if (!item) { // stand by
	} else if (item.style) {
		if (item.style.display == "none") {
			item.style.display = "";
		} else {
			item.style.display = "none";
		}
	} else {
		item.visibility = "show";
	}
	
}