function setBGI(layname,source){
	if(document.getElementById){
		document.getElementById(layname).style.backgroundImage = source
	}
}

function showLAYER(layname){
	if(document.getElementById){
		document.getElementById(layname).style.visibility='visible'
	}
}

function hideLAYER(layname){
	if(document.getElementById){
		document.getElementById(layname).style.visibility='hidden'
	}
}