Rails spinoffs - Dec 2005 - swap css class

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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