Mysql product colour change.

[flandish]

I have this code:

 

$(document).ready(function() {  
$('select').change(function(){
   $('#primary_block #image-block', $(this).parent()).removeClass('green blue').addClass(
    $(this).find('option:selected').text().toLowerCase().replace(/\s/g, "")
   );
})
.change();
});

 

It changes the background colour of a selected div when an option is selected from a dropdown box.

What do I need to change for it to work with custom attributes and where do I place it? (along with the "green" and "blue" classes). The classes are:

 

.green{
 background-color:green;
}
.blue{
 background-color:blue;

 

As you can see I have already tried targeting "#primary_block #image-block" with no luck

 

Any help would be great! Thanks.