How to switch images with this code

[Matt-One]

Hello i would like to use the orange/blu baloon like in mybb-es.com site
Example here : http://www.mybb-es.com/Hilo-como-puedo-cambiar-estoo

i found this code to add in the postbit :

PHP Code:

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<div id="1" style="float:left; z-index: 1; position: Absolute;"> <br><img src="images/globito01.png"> </div> <div id="2" style="z-index: 0; padding: 5px;"> <fieldset class="<if $thread['uid'] == $post['uid'] then>post_op<else>post_otro</if> ""> {$post['message']} </div> </div>

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and this code in the global.css

PHP Code:

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fieldset.post_op { background: #ffffff; border:2px solid #bde1fd; -moz-border-radius:8px; box-shadow: 0 0 1em #b6b6b6; -webkit-border-radius:8px; position: relative; } fieldset.post_otro { background: #ffffff; border:2px solid #f4c98c; -moz-border-radius:8px; box-shadow: 0 0 1em #b6b6b6; -webkit-border-radius:8px; position: relative; }

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But the problem is this : the color of the line changes between orange and blu depending on who answered but the globito01.png doesn't switch to the globito02.png because i don't know how and where to put it in the code

globito01.png is for the blu line and globito02.png is for the orange line

Thank you so much