if (document.images){

mpdown = new Image()
mpdown.src = "../images/btn_mp_off.gif"
mpup = new Image()
mpup.src = "../images/btn_mp_on.gif"

whdown = new Image()
whdown.src = "../images/btn_wh_off.gif"
whup = new Image()
whup.src = "../images/btn_wh_on.gif"

ddown = new Image()
ddown.src = "../images/btn_d_off.gif"
dup = new Image()
dup.src = "../images/btn_d_on.gif"

osdown = new Image()
osdown.src = "../images/btn_os_off.gif"
osup = new Image()
osup.src = "../images/btn_os_on.gif"

scdown = new Image()
scdown.src = "../images/btn_sc_off.gif"
scup = new Image()
scup.src = "../images/btn_sc_on.gif"

}