obtener valor de select para usarlo en un input

[goteen_mx]

function f_asignVal(slct){
document.getElementById("txt_id").value= slct.options[slct.selectedIndex].value;
}

<select name="country" id="paises" class="country" onChange="f_asignVal(this);">
..........
........
........
</select>

<input type="text" id="txt_id" class="item_country" value="" />

Salu2