Como mostrar borda da div ao clicar

Amigos, como mostrar borda da div ao clicar nela?

Fiz com onmouse, mas não sincronizava com este código:

(function($){var i=function(e){if(!e)var e=window.event;e.cancelBubble=true;if(e.stopPropagation)e.stopPropagation()};$.fn.checkbox=function(f){try{document.execCommand('BackgroundImageCache',false,true)}catch(e){}var g={cls:'jquery-checkbox',empty:'empty.png'};g=$.extend(g,f||{});var h=function(a){var b=a.checked;var c=a.disabled;var d=$(a);if(a.stateInterval)clearInterval(a.stateInterval);a.stateInterval=setInterval(function(){if(a.disabled!=c)d.trigger((c=!!a.disabled)?'disable':'enable');if(a.checked!=b)d.trigger((b=!!a.checked)?'check':'uncheck')},10);return d};return this.each(function(){var a=this;var b=h(a);if(a.wrapper)a.wrapper.remove();a.wrapper=$('<span class="'+g.cls+'"><span class="mark"><img src="'+g.empty+'" /></span></span>');a.wrapperInner=a.wrapper.children('span:eq(0)');a.wrapper.hover(function(e){a.wrapperInner.addClass(g.cls+'-hover');i(e)},function(e){a.wrapperInner.removeClass(g.cls+'-hover');i(e)});b.css({position:'absolute',zIndex:-1,visibility:'hidden'}).after(a.wrapper);var c=false;if(b.attr('id')){c=$('label[for='+b.attr('id')+']');if(!c.length)c=false}if(!c){c=b.closest?b.closest('label'):b.parents('label:eq(0)');if(!c.length)c=false}if(c){c.hover(function(e){a.wrapper.trigger('mouseover',[e])},function(e){a.wrapper.trigger('mouseout',[e])});c.click(function(e){b.trigger('click',[e]);i(e);return false})}a.wrapper.click(function(e){b.trigger('click',[e]);i(e);return false});b.click(function(e){i(e)});b.bind('disable',function(){a.wrapperInner.addClass(g.cls+'-disabled')}).bind('enable',function(){a.wrapperInner.removeClass(g.cls+'-disabled')});b.bind('check',function(){a.wrapper.addClass(g.cls+'-checked')}).bind('uncheck',function(){a.wrapper.removeClass(g.cls+'-checked')});$('img',a.wrapper).bind('dragstart',function(){return false}).bind('mousedown',function(){return false});if(window.getSelection)a.wrapper.css('MozUserSelect','none');if(a.checked)a.wrapper.addClass(g.cls+'-checked');if(a.disabled)a.wrapperInner.addClass(g.cls+'-disabled')})}})(jQuery);

Minha div está assim:

<div id="borda"></div>