// JavaScript Document

function cambiarFondo(idItem,color){
	document.getElementById(idItem).style.backgroundColor=color;
}

function mostrarTXT(idItem,selItem,frm){
	sel = document.forms[frm].elements[selItem].selectedIndex;
	valueSel = document.forms[frm].elements[selItem].options[sel].value;
	if (valueSel=='especificar'){
		document.getElementById(idItem).style.display='';
	}else{
		document.getElementById(idItem).style.display='none';
	}
}

function soloNum(input,frm){
	if (isNaN(document.forms[frm].elements[input].value)){
		alert("Debe escribir un número");
		document.forms[frm].elements[input].value="";
	}	
}