Редактирование количества товара в корзине кнопками "+", "-" (Joomshoping) - Дизайн и оформление

<input type = "text" name = "quantity[<?php print $key_id ?>]" value = "<?php print $prod['quantity'] ?>" class = "inputbox" style = "width: 25px" />

<input type = "text" name = "quantity[<?php print $key_id ?>]" id="quantity[<?php print $key_id ?>]" value = "<?php print $prod['quantity'] ?>" class = "inputbox" style = "width: 25px" />
<input type="button" value="+" onclick="var qty_el = document.getElementById('quantity[<?php print $key_id ?>]'); var qty = qty_el.value; if( !isNaN( qty )) qty_el.value++;return false;" />
<input type="button" value="-" onclick="var qty_el = document.getElementById('quantity[<?php print $key_id ?>]'); var qty = qty_el.value; if( !isNaN( qty ) && qty > 0 ) qty_el.value--;return false;" />

<input type = "text" name = "quantity[<?php print $key_id ?>]" id="quantity[<?php print $key_id ?>]" value = "<?php print $prod['quantity'] ?>" class = "inputbox" style = "width: 25px" />
<input type="button" value="+" onclick="var qty_el = document.getElementById('quantity[<?php print $key_id ?>]'); var qty = qty_el.value; if( !isNaN( qty )) qty_el.value++;return false;" />
<input type="button" value="-" onclick="var qty_el = document.getElementById('quantity[<?php print $key_id ?>]'); var qty = qty_el.value; if( !isNaN( qty ) && qty > 0 ) qty_el.value--;return false;" />

value="+"

value="-"

<input type="image" src="путь до картинки" onclick="var qty_el = document.getElementById('quantity[<?php print $key_id ?>]'); var qty = qty_el.value; if( !isNaN( qty ) && qty > 0 ) qty_el.value--;return false;" />