function changemybackup_off(myback) {
document.getElementById(myback).style.background = "url(http://excelloywelding.com/css/main_styles/images/menu_grey.jpg)";
document.getElementById(myback).style.color = "#000000";
}

function changemybackdwn_off(myback) {
document.getElementById(myback).style.background = "url(http://excelloywelding.com/css/main_styles/images/menu_black.jpg)";
document.getElementById(myback).style.color = "#FFFFFF";
}

function changemybackup_on(myback) {
document.getElementById(myback).style.background = "url(http://excelloywelding.com/css/main_styles/images/menu_grey.jpg)";
}

function changemybackdwn_on(myback) {
document.getElementById(myback).style.background = "url(http://excelloywelding.com/css/main_styles/images/menu_yellow.jpg)";
}