function abre_foto(end,name,tamanho) { 
	  window.open(end,name,tamanho);
	}
	function showText(ob, txt){
		if (ob.value == "") {
			ob.value = txt;
		}
	}
	function clearText(ob, txt){
		if (ob.value == txt) {
			ob.value = "";
		}
	}