How to change Contact Us and My Account Side banners

You can open the file of app\design\frontend\default\jm_neros\layout\catalo g.xml
Look for these defined blocks to change the texts you you wish

HTML Code:

 <block type="core/template" name="left.permanent.callout" template="callouts/left_col.phtml">
                <action method="setImgSrc"><src>images/media/col_left_callout.jpg</src></action>
                <action method="setImgAlt" translate="alt" module="catalog"><alt>Our customer service is available 24/7. Call us at (555) 555-0123.</alt></action>
                <action method="setLinkUrl"><url>checkout/cart</url></action>
            </block>

and

HTML Code:

<reference name="right">
             <block type="core/template" name="right.permanent.callout" template="callouts/right_col.phtml">
                <action method="setImgSrc"><src>images/media/col_right_callout.jpg</src></action>
                <action method="setImgAlt" translate="alt" module="catalog"><alt>Keep your eyes open for our special Back to School items and save A LOT!</alt></action>
            </block>
        </reference>

Hope it works for you !