JSFiddle - React, Tailwind, and code Playground

HTML

<a id="nav_next">
<input id="submitter" type="image" name="submitter" src="/favicon.png" height="100" width="100"/>
</a>

JavaScript

$('nav_next').addEvent('click',function(){
    childinput = this.getElement('input');
    if ( childinput.getStyle('disabled') != 'true' ) {
        alert('enabled');  
    }
    childinput.setStyle('disabled','true').setStyle('opacity','.6'); 
});