How to use javascript in apex application?

hi,everyone
I learn the apex, I want to develop the app,but page need accumulate the select items in client,and show the value in another text Field. For instance, there are 10 Select Lists in page, every select list has 3 values(Y\N\NA),the text Field need to accumulate the 'N' value of 10 Select Lists and show result (default is 0)when I change the Select Lists. I know how to real in HTML page by javascript,but no know to use in APEX, please everyone help me ?\
thanks!

thanks,Alan Martini. I finish it. As follows.
<script type="text/javascript">
function getEmployeeInfo(filter)
var ename1 = document.getElementById("P4010008_INTRO_PHASE1").value;
var ename2 = document.getElementById("P4010008_INTRO_PHASE2").value;
var ename3 = document.getElementById("P4010008_INTRO_PHASE3").value;
var ename4 = document.getElementById("P4010008_INTRO_PHASE4").value;
var ename5 = document.getElementById("P4010008_HAN_PHASE1").value;
var ename6 = document.getElementById("P4010008_HAN_PHASE2").value;
var ename7 = document.getElementById("P4010008_HAN_PHASE3").value;
var ename8 = document.getElementById("P4010008_HAN_PHASE4").value;
var ename9 = document.getElementById("P4010008_TOOLS_USAGE1").value;
var ename10 = document.getElementById("P4010008_TOOLS_USAGE2").value;
var ename11 = document.getElementById("P4010008_CLOSING_PHASE1").value;
var ename12 = document.getElementById("P4010008_CLOSING_PHASE2").value;
var ename13 = document.getElementById("P4010008_CLOSING_PHASE3").value;
var val1=0;
var val2=0;
var fatal="pass";
if(ename3==2&&ename4==2)
val1=2;
else if((ename3!=2&&ename4==2)||(ename3==2&&ename4!=2)){
val1=1;
else
{   val1=0; 
document.getElementById("P4010008_SCORE").value=val1;
if(ename1==2)
{ val2++;
if(ename2==2)
{ val2++;
if(ename3==2)
{ val2++;
if(ename4==2)
{ val2++;
if(ename5==2)
{ val2++;
if(ename6==2)
{ val2++;
if(ename7==2)
{ val2++;
if(ename8==2)
{ val2++;
if(ename9==2)
{ val2++;
if(ename10==2)
{ val2++;
if(ename11==2)
{ val2++;
if(ename12==2)
{ val2++;
if(ename13==2)
{ val2++;
if(val2/13.0>0.40)
fatal="fail";
document.getElementById("P4010008_FATAL").value=fatal;
</script>
Edited by: cdavid on 2011-2-18 下午12:57
Edited by: cdavid on 2011-2-22 下午1:42

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