function Change_Big_One(thumb){
document.getElementById('BigOne').src=thumb.src.replace("_th","")
}

function Change_Big_One2(thumb){
document.getElementById('BigOne2').src=thumb.src.replace("_th","")
}

function Change_Big_One3(thumb){
document.getElementById('BigOne3').src=thumb.src.replace("_th","")
}