[devote]

var list = [];

function(){
    if ( list.length == 0) {
        for( var i = 1; i <= 20; i++ ) {
            list.push( i );
        }
    }
    var randomKart = list[ Math.floor( Math.random() * list.length ) ];
    var element  = new Element('img', {src: 'kart/'+randomKart+'.png'}); 
    $(myDiv).adopt(element);
    list.splice( randomKart, 1 );
}