Conditional tags in header

I wonder if somebody can help me with this php syntax
I am new to php and I was trying to use Angsumans adrotator in my header. It works fine when I use it like this:

<div id=\\"banner\\">
<?php echo getad('bannerhome');?>
</div>

But I want the adrotator be dependent of wich category your viewing, so I made this code:

<div id=\\"banner\\">
<?php if (is_home ()) {
    echo getad('bannerhome');
/*for non specific category*/ } elseif (is_category ()) {
 	echo getad('bannerhome');
/*agenda cultural*/ } elseif (is_category ('2')) {
	echo getad('bannercultural');
/*noticias*/ } elseif (is_category ('3')) {
	echo getad('bannernoticias');
/*reportaje*/ } elseif (is_category ('4')) {
	echo getad('bannernoticias');
/*libros*/ } elseif (is_category ('5')) {
	echo getad('bannernoticias');
}
?>
 </div>

Anybody knows where I went wrong?