function makeEmail(a,b,c,d) {
    
    var name=a+b;
    var domain=c+d;
    
    document.write( ' <a title="Indirizzo Email" accesskey="a" tabindex="5" href="mailto:' );
    document.write( name + '&#64;' );
    document.write( domain + '">' );
    
    
    document.write(a+b+'&#64;'+c+d);
    
    document.write( '</a>' );
    
}


makeEmail("gianca", "rlo.durso", "gm", "ail.com");