function SwapImage(ImageName,ImageFile) {
         Image1=new Image(119,39);
         Image1.src = ImageFile;
         document[ImageName].src = Image1.src;
         return true;
}

function VisibleCityName(id) {
	if (document.getElementById) {
    	document.getElementById("cityname" + id).style.visibility = "visible";
    }
}

function HiddenCityName(id) {
	if (document.getElementById) {
    	document.getElementById("cityname" + id).style.visibility = "hidden";
    }
}

function changeClass(id, classname) {
	if (document.getElementById) {
    	document.getElementById(id).className = classname;
    }
}