function showformule(bp) { 
	if(bp == 0) {
		document.getElementById('formulebasic').style.display='block';
		document.getElementById('formulepro').style.display='none';
	}
	if(bp == 1) {
		document.getElementById('formulebasic').style.display='none';
		document.getElementById('formulepro').style.display='block';
	}
}
function showcroix() {
	if(document.getElementById('croix_img').style.display == 'block') {
		document.getElementById('croix_img').style.display='none';
		document.getElementById('croix_vide').style.display='block';
	}
	else {
	if(document.getElementById('croix_img').style.display == 'none')
		document.getElementById('croix_img').style.display='block';
		document.getElementById('croix_vide').style.display='none';
	}
	if(document.getElementById('croix_img').style.display == "") { 
		document.getElementById('croix_img').style.display='none';
		document.getElementById('croix_vide').style.display='block';
	}
}