Javascript to concatonate two fields

Hi,
I'm trying to get variable outputs from two fields and combine the results into one field.
1. If both fields are blank (CHANNEL_NO_P1 and CHANNEL_NO_P2), the concatonated field is blank.
2. If the first field has content but the second field does not, the concatonated should just show the content of the first field (CHANNEL_NO_P1)
3. Else the concatonated field shows the joining of both fields.
I have the part 1 and 3 working but when i add part 2, it screws up the script. (shown below.)
if
(RadioDuplexer.RadioDuplexerAssetPage1.RadioDuplexerDetailsSubForm.CHANNEL_NO_P1.isNull || RadioDuplexer.RadioDuplexerAssetPage1.RadioDuplexerDetailsSubForm.CHANNEL_NO_P2.isNull) {
    this.rawValue = "";
else if (!(RadioDuplexer.RadioDuplexerAssetPage1.RadioDuplexerDetailsSubForm.CHANNEL_NO_P1.isNull ) || RadioDuplexer.RadioDuplexerAssetPage1.RadioDuplexerDetailsSubForm.CHANNEL_NO_P2.isNull} {
    RadioDuplexer.RadioDuplexerAssetPage1.RadioDuplexerDetailsSubForm.CHANNEL_NO_P1;
else {
    this.rawValue = RadioDuplexer.RadioDuplexerAssetPage1.RadioDuplexerDetailsSubForm.CHANNEL_NO_P1.rawValue + RadioDuplexer.RadioDuplexerAssetPage1.RadioDuplexerDetailsSubForm.CHANNEL_NO_P2.rawValue;
I'm sure it's just syntax around the 'not null' part but i can't seem to get it working. Can anyone help?
Cheers
Rob

Thank Niall.
I've tidied up the script as below.
if (RadioDuplexer.RadioDuplexerAssetPage1.RadioDuplexerDetailsSubForm.CHANNEL_NO_P2.rawValue == null)
{this.rawValue = RadioDuplexer.RadioDuplexerAssetPage1.RadioDuplexerDetailsSubForm.CHANNEL_NO_P1.rawValue; }
else {this.rawValue = RadioDuplexer.RadioDuplexerAssetPage1.RadioDuplexerDetailsSubForm.CHANNEL_NO_P1.rawValue + RadioDuplexer.RadioDuplexerAssetPage1.RadioDuplexerDetailsSubForm.CHANNEL_NO_P2.rawValue; }
And made CHANNEL_P2 field invisible until CHANNEL_P1 is entered.
Thanks again for your help.
Cheers
Rob

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