[devote]

var images = document.getElementById('cool').getElementsByTagName('img');
for( var i = 1; i < images.length; i++ ) {
    if ( images[ i ].addEventListener ) {
        images[ i ].addEventListener( 'click', function() {
            images[ 0 ].src = this.src
        }, false );
    } else {
        images[ i ].attachEvent( 'onclick', function() {
            images[ 0 ].src = window.event.srcElement.src;
        });
    }
}