function tabon(n){
	m = 'mb_tab'+n
	document.images[m].src = "/image/mb_tab/mb_tab_sel1.gif"
}
function taboff(n){
	m = 'mb_tab'+n
	document.images[m].src = "/image/clr/c_bnk.gif"
}

function tab2on(n){
	m = 'mb_tab'+n
	document.images[m].src = "/image/mb_tab/mb_tab_sel21.gif"
}
function tab2off(n){
	m = 'mb_tab'+n
	document.images[m].src = "/image/clr/c_bnk.gif"
}