function ubpostpodOn(coor,btn){
	elem_btn = document.getElementById("btn_"+btn);
	elem_btn.style.backgroundPosition = "bottom left";			
}

function ubpostpodOff(btn){
	elem_btn = document.getElementById("btn_"+btn);
	elem_btn.style.backgroundPosition = "top left";	
}

function ubpostButtonOn(layer_ref){
	elem = document.getElementById("btn_"+layer_ref);
	elem.style.backgroundPosition = "bottom left";
}

function ubpostButtonOff(layer_ref){
	elem = document.getElementById("btn_"+layer_ref);
	elem.style.backgroundPosition = "top left";
}