Form validation

hi (again), I finally found a tutorial on how to get a form with checkboxes to work–but, I’m trying to make it where all the feilds have to be filled out before you can submit it. I just don’t know what to put in this area.

here is the code–the problem is down at the bottom—

mc=this;
tfA=[“company”, “contact”, “address”, “city”, “state”, “zip”, “phone”, “email”, “addinfo”];
cbA=[“individual”, “group”, “medicare”, “prescription”, “life”, “annuities”, “longterm”];
submit_btn.onPress=function(){
lv=new LoadVars();
for(var i=0;i<tfA.length;i++){
lv[tfA*]=mc[tfA*].text;
}
for(var j=0;j<cbA.length;j++){
lv[cbA[j]]=mc[cbA[j]].selected;
}
lv.sendAndLoad(“email_request1.php”,lv,“POST”);
}

submit_btn.onRelease = function(){
//I just don’t know what to put after the if statment, I tried just the instance
names-no luck.
if ( “”){
_root.gotoAndPlay(“error”);
} else {
_root.gotoAndPlay(“correct”);
}
}

any suggestions?

thanks,
hutch