function hidetabs(){

document.images["facts"].src="/images/home_facts_off.gif"
document.images["flag"].src="/images/home_flag_off.gif"
document.images["climate"].src="/images/home_climate_off.gif"

}

function showtab(which){

hidetabs()
document.getElementById(which).style.display="block"
if (which=="tab1"){document.images["facts"].src="/imageshome_facts_on.gif"}
if (which=="tab2"){document.images["flag"].src="/imageshome_flag_on.gif"}
if (which=="tab3"){document.images["climate"].src="/imageshome_climate_on.gif"}

}