97,98c97,98
< 					$script = "c = this.parentNode.getElementsByTagName('div')[1]; if (this.value == 'Show') { c.style.display = ''; this.value = 'Hide' } else { c.style.display = 'none'; this.value = 'Show' }";
< 					$renderer->doc .= '<div class="spoiler"><div class="title">'. $payload .'</div><input type="button" value="Show" onClick="'. $script .'" /><div class="content" style="display: none">';
---
> 					$script = "c = this.parentNode.getElementsByTagName('div')[1]; if (this.value == '+') { c.style.display = ''; this.value = '-' } else { c.style.display = 'none'; this.value = '+' }";
> 					$renderer->doc .= '<div class="spoiler"><div class="title">'. $payload .'</div><input type="button" value="+" onClick="'. $script .'" /><div class="content" style="display: none">';