function showimg11(){document.menu1.src = "img/menu1-p1.jpg";}
function showimg12(){document.menu1.src = "img/menu1-p2.jpg";}
function showimg13(){document.menu1.src = "img/menu1-p3.jpg";}

function showimg21(){document.menu2.src = "img/menu2-p1.jpg";}
function showimg22(){document.menu2.src = "img/menu2-p2.jpg";}
function showimg23(){document.menu2.src = "img/menu2-p3.jpg";}

function showimg31(){document.menu3.src = "img/menu3-p1.jpg";}
function showimg32(){document.menu3.src = "img/menu3-p2.jpg";}
function showimg33(){document.menu3.src = "img/menu3-p3.jpg";}

function showimg41(){document.menu4.src = "img/menu4-p1.jpg";}
function showimg42(){document.menu4.src = "img/menu4-p2.jpg";}
function showimg43(){document.menu4.src = "img/menu4-p3.jpg";}

function showimg51(){document.menu5.src = "img/menu5-p1.jpg";}
function showimg52(){document.menu5.src = "img/menu5-p2.jpg";}
function showimg53(){document.menu5.src = "img/menu5-p3.jpg";}

function showimg61(){document.menu6.src = "img/menu6-p1.jpg";}
function showimg62(){document.menu6.src = "img/menu6-p2.jpg";}
function showimg63(){document.menu6.src = "img/menu6-p3.jpg";}

function showimg71(){document.menu7.src = "img/menu7-p1.jpg";}
function showimg72(){document.menu7.src = "img/menu7-p2.jpg";}
function showimg73(){document.menu7.src = "img/menu7-p3.jpg";}