[Rails-spinoffs] swap css class

[Marco M. Jaeger]

I was in need of a function to change (swap) css classes - this is what I 
came up with - maybe some of the prototype gurus could have a look at the 
function - I'm sure it needs some improvements, but basically it is working:

// usage:       toggle (boolean), elementId, old class, new class, tag(s)
//                      
Element.swapClassName(0,null,'oldClass','newClass','div');
//                      
Element.swapClassName(1,null,'oldClass','newClass','div','p');
//                      
Element.swapClassName(1,'elementId','oldClass','newClass','div');
Object.extend(Element, {
        swapClassName: function() { // toggle (boolean), element, from, to, 
tag(s)
		var i, j=0, x, tags, els = new Array(), args = 
Element.swapClassName.arguments;

                if ($(args[1])) { // element by id
                        els[j] = $(args[1]);
                } else { // element(s) by tag name
                        for (i = 4; i < args.length; i++) {
                        tags = document.getElementsByTagName(args[i]);
                        for (x = 0; x < tags.length; x++) {
                                els[j] = tags[x];
                                j++;
                        }
                        }
                }

                // swap class name of elements
                for (i = 0; i < els.length; i++) {
                        if (args[0] == 1) { // toggle class
                                if (Element.hasClassName(els[i],args[3])) {
                                        Element.removeClassName(els[i],args[3]);
                                        Element.addClassName(els[i],args[2]);
                                } else {
                                        Element.removeClassName(els[i],args[2]);
                                        Element.addClassName(els[i],args[3]);
                                }
                        } else { // don't toggle
                                Element.removeClassName(els[i],args[2]);
                                Element.addClassName(els[i],args[3]);
                        }
                }
        }
});

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