// calcul la surface du toit
function calculSurface() {
	f=document.devis_form;
	
	//-- Initialisation
	var res;
	var length = f.solar_roof_length.value;
	var width = f.solar_roof_width.value;
	
	//-- Vérifications
	if (isNaN(parseInt(length,10))
		|| isNaN(parseInt(width,10))) {
		return;
	}

	//-- Calcul
	res = length * width;

	//-- Affichage résultat
	f.solar_roof_surface.value = res;
	
	//alert(document.getElementById('toitureformbox '));
	
}

function afficheForm(id) {
	
	document.getElementById('toitureformbox ').style.display = 'none';
	document.getElementById('champsformbox ').style.display = 'none';
	if(id !== null)
		document.getElementById(id).style.display = 'block';
}

function inerent_comptor(value) {
	if(value == 'non') {
		document.getElementById('edf').disabled = true;
		document.getElementById('comptor_power').disabled = true;	
	} else if(value == 'oui'){
		document.getElementById('edf').disabled = false;
		document.getElementById('comptor_power').disabled = false;
	}
}

function inerent_line(value) {
	if(value == 'non') {
		document.getElementById('line_power').disabled = true;	
	} else if(value == 'oui'){
		document.getElementById('line_power').disabled = false;
	}
}
function inerent_terrain(value) {
	if(value == 'oui') {
		document.getElementById('terrain_inclination').disabled = "true";
		document.getElementById('terrain_exposure').disabled = "true";	
	} else if(value == 'non'){
		document.getElementById('terrain_inclination').disabled = false;
		document.getElementById('terrain_exposure').disabled = false;
	}
}