function toggle (one,two,three){
    
    var on = document.getElementById(one);
    var off = document.getElementById(two);
    var offf = document.getElementById(three);
    
    on.onmouseover="";
    on.onmouseout="";
    on.src="../images/thumb_layover_on.png";
    
    omo(off);
    omo(offf);

}

function omo (toggler){

    toggler.onmouseover="this.src='../images/thumb_layover_on.png'";
    toggler.onmouseout="this.src='../images/thumb_layover.png'";
    toggler.src="../images/thumb_layover.png";

}