var graphicDir = "/graphics/head/";
var series = new Array
("_04","_06","_08","_10","_12","_15","_16","_17","_18","_19","_20","_21","_22","_23");

function preloadImages() {
        for (s = 0; s < series.length; s++) {
                imgs[s] = new Image();
                imgs[s].src = graphicDir+"head"+series[s]+"_o.gif";
        }
}
                
function roll(roll,before,mode) {
        roll = roll - 1;
        if (mode == 1) {
                document.images[before].src = graphicDir+"head"+series[roll]+"_o.gif";
        } else {
                document.images[before].src = graphicDir+"head"+series[roll]+".gif";
        }
}