var bLoaded = false;
var aBnOn = new Array();
var aBnOff = new Array();

for (i=0;i<5;i++) {
	aBnOn[i] = new Image();
	aBnOff[i] = new Image();
}
aBnOn[0].src = "imgs/Bn_ourfirm_L.gif";
aBnOff[0].src = "imgs/Bn_ourfirm_D.gif";
aBnOn[1].src = "imgs/Bn_philos_L.gif";
aBnOff[1].src = "imgs/Bn_philos_D.gif";
aBnOn[2].src = "imgs/Bn_service_L.gif";
aBnOff[2].src = "imgs/Bn_service_D.gif";
aBnOn[3].src = "imgs/Bn_team_L.gif";
aBnOff[3].src = "imgs/Bn_team_D.gif";
aBnOn[4].src = "imgs/Bn_join_L.gif";
aBnOff[4].src = "imgs/Bn_join_D.gif";

function swapBn(iBnNo,bSwitch) {
	if (bLoaded) eval("document.images.bn"+iBnNo).src = bSwitch?aBnOn[iBnNo].src:aBnOff[iBnNo].src;
}

function init() {
	bLoaded = true;
}