function changeImage1(){
 document.menus.src="img/mton_s.gif";
}
function changeImage2(){
 document.menus.src="img/mt_s.gif";
}
function changeImage3(){
 document.menuf.src="img/mton_f.gif";
}
function changeImage4(){
 document.menuf.src="img/mt_f.gif";
}
function changeImage5(){
 document.menub.src="img/mton_b.gif";
}
function changeImage6(){
 document.menub.src="img/mt_b.gif";
}
function changeImage7(){
 document.menuw.src="img/mton_w.gif";
}
function changeImage8(){
 document.menuw.src="img/mt_w.gif";
}
function changeImage9(){
 document.menui.src="img/mton_i.gif";
}
function changeImage10(){
 document.menui.src="img/mt_i.gif";
}