function C_M_select_set_selected(select_name,value){
    l = document.forms[_form_name].elements[select_name].options.length;
    for(i=0; i<l; i++){        
        if(document.forms[_form_name].elements[select_name].options[i].value == value)
            document.forms[_form_name].elements[select_name].options[i].selected = true;
        else
            document.forms[_form_name].elements[select_name].options[i].selected = false;
    }
}

function C_M_select(form_name){
    _form_name = form_name;
    this.set_selected = C_M_select_set_selected;
}