reorder column content

I have this structure with 2 rows and 2 columns per row:

1o Row
[lgc_column last=”false”] IMAGE [/lgc_column] [lgc_column last=”true”]<div class=”myclass”> TEXT </div> [/lgc_column]

2o Row
[lgc_column last=”false”] IMAGE [/lgc_column] [lgc_column last=”true”]<div class=”myclass”> TEXT </div> [/lgc_column]

As you can see my first column of the first row contains an image, and the second column a large text.

In mobile deviceds It would be like this:

IMAGE
TEXT

TEXT
IMAGE

However I need something like this:

IMAGE
TEXT

IMAGE
TEXT

How can I position my second column of the second row on top of the first colunn only for mobile??…

Thanks.