Can this code be improved? jQuery with SharePoint

I have written some JavaScript code with jQuery to create collapsible webparts in SharePoint 2010.

Can someone suggest some improvements? As I think that the methods I am using for selectors are not ideal. The solution works perfectly as it is, I just want to ensure that I am being as efficient as possible.

Below is a snippet of the HTML that I am doing the processing on.

UPDATE: Just a note, I am starting from s4-wpTopTable because it is the best way for me to ensure I am dealing with a SharePoint webpart.

    
        
            
                
                    
                        
                             
                            
                                
                                    Links
                                
                            
                             
                        
                    
                
            
            
                
                    //CONTENT WILL BE IN HERE
                
            
        
    

And this is the jQuery that I am using:

jQuery(function($) {
    $('.s4-wpTopTable').find('tr:first h3').append('');
        var Collapse = "/_layouts/images/collapse.gif";
        var Expand = "/_layouts/images/expand.gif";
    $('.min').click(function(){     
        var img = $(this).children();
        $(this).closest('.s4-wpTopTable').find('tr:first').next().toggle().is(":visible") ? img.attr('src',Collapse) : img.attr('src',Expand );
    });
});

$('.s4-wpTopTable').find('tr:first h3')...

is the same as

$('.s4-wpTopTable tr:first h3')...

Only one hit for jQueury goodness instead of two.

also you're attaching the click handler after putting it into the DOM. You can do it the other way:

// ...
.append(
    $('')
        .click(function(){     
            var img = $(this).children();
            $(this)
                .closest('.s4-wpTopTable')
                .find('tr:first')
                .next()
                .toggle().is(":visible") ? img.attr('src',Collapse) : img.attr('src', Expand);
        })
);

StackExchange Code Review Q#6920, answer score: 3