var isIMG = document.images;
var Arrowon;
var Arrowoff;

if (isIMG) {
	Arrowon = new Image(7,7);
	Arrowon.src = "/images/arrow_over.gif";
	Arrowoff = new Image(7,7);
	Arrowoff.src = "/images/arrow_down.gif";
}
function Arrow(Arrowname) {
	if (isIMG) {
	document[Arrowname].src = (document[Arrowname].src.indexOf('arrow_over.gif') != -1) ? '/images/arrow_down.gif' : '/images/arrow_over.gif';

	}
}