function showhideDV(id,str)
{

			document.getElementById('arrow').name="t1";
			if(str=='show')
			pageopt.style.visibility="visible";              
			else
			pageopt.style.visibility="hidden";

		if (document.getElementById) 
		{ // DOM3 = IE5, NS6
			document.getElementById(id).style.display = 'block';
		}
		else 
		{
			if (document.layers) 
			{ // Netscape 4
				document.id.display = 'block';
			}
			else 
			{ // IE 4
				document.all.id.style.display = 'block';
			}
		}
}