function rut_autoformato(obj,e)
{
	var rut = obj.value;
	var key = e.charCode? e.charCode : e.keyCode;
	
	if (key != 37 && key != 39 )
	{
		window.status = rut;
		rut = rut.replace(/\./gi,""); 
		rut = rut.replace(/\-/gi,"");
		
		
		if ( rut.length<2 )
		{
			dv  = rut.substring(rut.length-1)
			rut = ""
		}
		else
		{
			dv  = rut.substring(rut.length-1)
			rut = rut.substring(0 , rut.length-1)
		}
		 
		obj.value =  rut + "-" + dv;
	}		
	

}