function ShowHide(objid) 
{
	obj=document.getElementById(objid);
	img1=document.getElementById(objid+'down_arrow1');
	img2=document.getElementById(objid+'down_arrow2');
	if (obj.style.display == "") 
	{
		obj.style.display = "none";
		img1.src = "images/downa.gif";
		img2.src = "images/downa.gif";
	}
	else
	{
		obj.style.display = "";
		img1.src = "images/upa.gif";
		img2.src = "images/upa.gif";
	}
	return false;
}