Javascript Nested If Statement

I have searched everywhere, but still unable to answer the question. Essentially, what I need to do is a nested if statement.

Below is my code, but i'm getting the error message saying "SyntaxError: expected expression, got keyword 'else', line 198", which is referencing the line after the alert!

         if((z!=='#EANF#')){
             var signdec
                signdec =  "CODE:"
                signdec +=  "TAG POS=1 TYPE=H1 ATTR=TXT:*" + "\n"
                signdec +=  "TAG POS=R3 TYPE=A ATTR=TXT:*" + "\n"
                signdec +=  "TAG POS=1 TYPE=P ATTR=TXT:No<SP>i<SP>data<SP>found. EXTRACT=TXT" + "\n"
                iimPlay(signdec);               
}       



                        alert(iimGetExtract())
                        else if((iimGetExtract()!=='#EANF#'));{
                        iimPlay(sign)
                        iimPlay(after)
                
}
                                alert(iimGetExtract())
                                else if((iimGetExtract()=='i'));{
                                iimPlay(goback)
                                iimPlay(goback)                         
}



                        else if((iimGetExtract()=='#EANF#')){
                                iimPlay(goback)
                                iimPlay(goback)
                                
}


        else((z=='#EANF#'));{
        iimPlay(goback)
}       

Any help appreciated, also If there is a way to shorten this, please let me know.