function byId(elDOM){
		return document.getElementById(elDOM) || null;
	}
	
	function showText( nameSection )
	{
		var style = byId('Tr_' + nameSection).style;
		
		if( style.display == "none" )
		{			
			byId('Img_' + nameSection).src = 'imagens/minus.gif';
			style.display = "";
		}
		else{
			byId('Img_' + nameSection).src = 'imagens/plus.gif';
			style.display = "none";
		}		
	}