function toggleDisplay(elmt)
		{
	eltimg="img"+elmt;
			if(document.getElementById(elmt).style.display == "block") 
			{ 
				document.getElementById(elmt).style.display = "none"; 
				document.getElementById(eltimg).src="images/plus.png";

			} 
			else 
			{ 
			document.getElementById(elmt).style.display = "block";
			document.getElementById(eltimg).src="images/minus.png";
			} 

		}