function IsNumeric(passedVal){
		var ValidChars = "0123456789.()-";
		var IsNumber=true;
		var Char;
		if(passedVal == "")
			{return false;}
		for (i = 0; i < passedVal.length && IsNumber == true; i++)
		{
			Char = passedVal.charAt(i);
			if (ValidChars.indexOf(Char) == -1)
			{
				IsNumber = false;
			}
		}
		return IsNumber;
	}
	
	function ajax_modelos(){
		IDmarca = $F('select_marcas');
		if (!IsNumeric(IDmarca)) return false;
		$("modelos").innerHTML = '<center><img style="margin-top:2px;" src="images/cargando.gif" border="0"></center>';
		params = "IDmarca="+IDmarca;
		var ajax = new Ajax.Updater("modelos","ajax.modelos.php",
			{
				encoding: "iso-8859-1",
				method: "GET",
				parameters: params,
				evalScripts: true
			}
		);
	}
	
	function presupuesto(){
		IDmodelo = $F('select_modelos');
		window.location.href='presupuesto.php?IDmodelo='+IDmodelo;
	}
	function datos_pais(){
		IDmodelo = $F('pais');
		window.location.href='/pais/'+IDmodelo;
	}