1. Backup your custom skin directory in uifiles in case this, for some reason, doesnt work.
2. Download the patch.
3. Open your ./uifiles/customskin/EQUI_Animation.xml file with a program like WordPad.
Add the follow lines to the end of the file but BEFORE the </XML> tag.
Code:
<Ui2DAnimation item = "A_CheckBoxNormal">
<Frames>
<Texture>window_pieces01.tga</Texture>
<Location>
<X>70</X>
<Y>90</Y>
</Location>
<Size>
<CX>11</CX>
<CY>11</CY>
</Size>
<Hotspot>
<X>0</X>
<Y>0</Y>
</Hotspot>
</Frames>
</Ui2DAnimation>
<Ui2DAnimation item = "A_CheckBoxPressed">
<Frames>
<Texture>window_pieces01.tga</Texture>
<Location>
<X>82</X>
<Y>90</Y>
</Location>
<Size>
<CX>11</CX>
<CY>11</CY>
</Size>
<Hotspot>
<X>0</X>
<Y>0</Y>
</Hotspot>
</Frames>
</Ui2DAnimation>
4. Run EQ.
mg.