switch

console.log('<img src="');

var les_animaux = 'chats';
switch(les_animaux)
{
    case 'chats':
    	console.log('http://i.imgur.com/4AiXzf8.jpg');
        break;
    case 'chiens':
    	console.log('http://i.imgur.com/A8eQsll.jpg');
        break;
    case 'singes':
    	console.log('http://i.imgur.com/CXwaR8c.jpg');
        break;
    case 'les humains':
    	console.log('http://i.imgur.com/u0mFu.jpg');
        break;
}

console.log('"/>');