The Big Dumb Developer

A suggestion from the last post - make the select all toggle the results. Sounds good to me. The functionality of the link will be:
if all the boxes are checked, then uncheck all of them, else check all the boxes.

We can extend the previous code to first determine whether we'll be checking or unchecking:

var checked = false;
for( var i = 0; inputs && i < inputs.length; i++ ){
    if( inputs[i].type == "checkbox" && inputs[i].checked == false ){
        checked = true;
        break;
    }   
}

Then, use the checked variable in the lower loop. The final code looks like this:

BIGDUMBDEV.selectAll = function(element){
    element = this.getElement(element) || document;
    if( element && element.getElementsByTagName ){
        var inputs = element.getElementsByTagName("input");
        var checked = false;
        for( var i = 0; inputs && i < inputs.length; i++ ){
            if( inputs[i].type == "checkbox" && inputs[i].checked == false ){
                checked = true;
                break;
            }   
        }
        
        for( var i = 0; inputs && i < inputs.length; i++ ){
            if( inputs[i].type == "checkbox" )
                inputs[i].checked = checked;
        }
    }   
}