var winCatalog;

function openCatalog(url){
	if( winCatalog && !winCatalog.closed ){
		winCatalog.focus();
	}else{
		var left = (screen.width - 1000) / 2;
		var top = (screen.height - 700) / 2;
		winCatalog = window.open( url, 'catalogueinteractif', 'width=1000,height=700,left=' + left + ',top=' + top );
	}
}