Multiple Form Field Validation

I run throught these series of checks before submitting the variables to the .jsp script. Problem is that it will ignore the sender name and receipient name as long as there are two email addresses. Why is that?
if (sendername eq "") {
        nameerrorTXT.text = "PLEASE ENTER YOUR NAME";
    if (emailfrom.indexOf("@")<0 or emailfrom.indexOf(".")<0) {
        emailfromerror.text= "PLEASE USE A VALID EMAIL ADDRESS";
        emailfromTXT.text = "";
    if (recipientname eq "") {
        recipientnameerrorTXT.text= "PLEASE ENTER YOUR FRIEND'S NAME";
        recipientnameTXT.text = "";
    if (emailto.indexOf("@")<0 or emailto.indexOf(".")<0) {
            emailtoerror.text= "PLEASE USE A VALID EMAIL ADDRESS";
            emailtoTXT.text = "";
    } else {
        _root.sendername = sendername;
        _root.recipientname = recipientname;
        _root.emailfrom = emailfrom;
        _root.emailto = emailto;
        _root.emailsubject = sendername + " " + emailsubject;
        _root.emailbody = emailbody;
        _root.loadVariables("/jsp/sendMail.jsp", "POST");
        sendernameTXT.text = "";
        recipientnameTXT.text = "";
        emailfromTXT.text = "";
        emailtoTXT.text = "";
        nextFrame();

Thanks Klad,
I actually tried that route. The problem was that if any one of those 'if' statements were true the the function would stop and I needed the function to check AND respond to each field if needed. I found that the 'else' statement would fire regardless to all the 'if' statements except for the one just before it.
I'm sure there is a better way to do and I'd like to know how but I solved the issue by creating a last 'if' statement that lumped all the if statements together. This way I would achieve the error feedback needed AND keep the 'ELSE' statement from firing. See below
submitBNT.onPress = function(){
    if (sendername eq undefined | sendername eq "") {
        nameerrorTXT.text = "PLEASE ENTER YOUR NAME";
        sendernameTXT.text = "";
    if (emailfrom.indexOf("@")<0 | emailfrom.indexOf(".")<0) {
        emailfromerror.text= "PLEASE USE A VALID EMAIL ADDRESS";
        emailfromTXT.text = "";
    if (recipientname eq undefined | recipientname eq "") {
        recipientnameerrorTXT.text= "PLEASE ENTER YOUR FRIEND'S NAME";
        recipientnameTXT.text = "";
    if (emailto.indexOf("@")<0 | emailto.indexOf(".")<0) {
            emailtoerror.text= "PLEASE USE A VALID EMAIL ADDRESS";
            emailtoTXT.text = "";
    if (sendername eq undefined | sendername eq "" | emailfrom.indexOf("@")<0 or emailfrom.indexOf(".")<0 | recipientname eq undefined | recipientname eq "" | emailto.indexOf("@")<0 or emailto.indexOf(".")<0) {
        /// DO NOTHING
    } else {
        processMailForm();

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