How to create event when AutoSuggest should set <select> element

i have an autosuggest event to display data to input field like this

[code=html]
function display_sn(sn_code, nation_name, supp_desc, sStartDate, sEndDate){
document.getElementById(‘nation_name’).innerHTML = nation_name;
document.getElementById(‘supp_desc’).innerHTML = supp_desc;
document.getElementById(‘sStartDate’).innerHTML = sStartDate;
document.getElementById(‘sEndDate’).innerHTML = sEndDate;
document.getElementById(‘sn_code’).value = sn_code;
document.getElementById(‘box_sn’).style.display = ‘none’;
}
[/code]

and i would like to set an <select> element to add onChange properties like this

[code=html]
onChange=”document.getElementById(‘row_pop_date’).style.visibility = ‘visible’; document.getElementById(‘row_upload_pop’).style.visibility = ‘visible’;”
[/code]

so, when i clicked on my autosuggest, the select would be like this

[code=html]
<select name=”warranty_flag” onChange=”document.getElementById(‘row_pop_date’).style.visibility = ‘visible’; document.getElementById(‘row_upload_pop’).style.visibility = ‘visible’;”>
[/code]

so how the command from that function to set onChange parameter at <select>

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