var images = new Array('img/pic_01_bton.gif','img/pic_02_bton.gif','img/pic_03_bton.gif');
var adjustImg = "";

function preload() {
    for (var i=0;i<images.length;i++) {
        var Bild = new Image();
        Bild.src = images[i];
    }
}

function swapImage(name,oversource) {
    if (name != adjustImg || adjustImg == "")
    document.images[name].src = oversource;
}

function adjust(name,source) {
	document.images[name].src = source;
	adjustImg = name;
}