Getting values of select box

[davebat]

I am trying to retrieve the value of some selects on my page i am trying this

var day = document.form2.F_C_DAY.selectedIndex.value
var month = document.forms.form2.F_C_MONTH.value
var year = document.forms.form2.F_C_YEAR.value


but alerting them gives undefined. what am i doing wrong