function cm2px(cm)
	{
	//return(cm/170*745);
	return(cm/Largeur_du_canape_cm*Largeur_du_canape_px);
	}
	
function MontreEchelle(pic,h,w)
	{
	var r=$('Rideau');
	var e=$('Echelle');
	var z=$('ImageZoom');
	// 760/2=380
	z.style.position='absolute';
	z.src 		= '/galeries/'+pic;
	z.style.height 	= ''+cm2px(h)+'px';
	z.style.width		= ''+cm2px(w)+'px';
	z.style.left='50%';
	z.style.top='50%';
	z.style.marginLeft = (-cm2px(w)/2+52)+'px';
	z.style.marginTop = (-cm2px(h)/2-109)+'px';
	z.style.position = 'fixed';
	
	$('ZoomEchelleInfos').innerHTML = '' + parseInt(h) + ' cm x ' + parseInt(w) + ' cm<br>' +  (h*0.393700787).toFixed(1) + ' in. x ' + (w*0.393700787).toFixed(1) + ' in.';
	
	r.style.backgroundColor ='#CCCCCC';
	
	//alert(z.height);
	//alert(z.style.marginTop);	
	r.style.display='';
	e.style.display='';
	z.style.display='';
	
	
	//document.append	
	}