function changeImage0a(){
    document.menu_0.src="../img/menu_0a.gif";
}
function changeImage0b(){
    document.menu_0.src="../img/menu_0b.gif";
}


function changeImage1a(){
    document.menu_1.src="../img/menu_1a.gif";
}
function changeImage1b(){
    document.menu_1.src="../img/menu_1b.gif";
}



function changeImage2a(){
    document.menu_2.src="../img/menu_2a.gif";
}
function changeImage2b(){
    document.menu_2.src="../img/menu_2b.gif";
}



function changeImage3a(){
    document.menu_3.src="../img/menu_3a.gif";
}
function changeImage3b(){
    document.menu_3.src="../img/menu_3b.gif";
}



function changeImage4a(){
    document.menu_4.src="../img/menu_4a.gif";
}
function changeImage4b(){
    document.menu_4.src="../img/menu_4b.gif";
}



function changeImage5a(){
    document.menu_5.src="../img/menu_5a.gif";
}
function changeImage5b(){
    document.menu_5.src="../img/menu_5b.gif";
}



function changeImage6a(){
    document.menu_6.src="../img/menu_6a.gif";
}
function changeImage6b(){
    document.menu_6.src="../img/menu_6b.gif";
}