function showMenu (id,imgname)
{

var imgon;
var imgoff;
imgon = "img/arr2.gif";
imgoff = "img/arr.gif";

		var display, targetElement;
		targetElement=document.getElementById(id);

		if(targetElement.style.display=='none') {
			display='';
		document.images[imgname].src=imgon;	
		} else {
			display='none';
		document.images[imgname].src=imgoff;
		}
		targetElement.style.display = display;
	

}