JQuery works only for a one time
<p>I wrote jquery function for emphasis clicked <code>&lt;h4&gt;</code> tag. but it only works an one time. so how I solve that problem. this is my code.</p>

<pre><code>   $(document).ready(function(){
        $('h4').click(function(){
            var a = $('h4').attr('style');
            if(a=='font-size: 1.5em'){
                $(this).css('font-size','2.5em');
            }
            else{
                $(this).css('font-size','1.5em');
            }
        });
    });  
</code></pre>
