Hover text displaying

[admin]

I am doing a xml dialog popup. I need add hover text when the cursor over the textbox and the image, I tried so many ways, but they all failed

below is my code
<?xml version="1.0" encoding="UTF-8"?>
<dialog beanclass="xxx.InputSpecBean" datasrc="ChangeFirewallDialog" id="ChangeFirewallDialog" label="Request to Change Firewall Service" relationship="SHOPSPEC" >
<section id="cfw_dial_sec1">
<sectionrow id="cfw_main_grid1_row1">
<sectioncol id="cfw_main_grid1_row1_col1">
<section id="cfw_main_grid1_row1_col1_1">
<image height="170" id="cfw_offering_image" imagename="firewall.jpg" label="Firewall Request" thumbnail="true"/>
</section>
</sectioncol>
<sectioncol id="cfw_main_grid1_row1_col2">
<section id="cfw_main_grid1_row1_col2_1">
<textbox dataattribute="aln1" id="cfw_dial_sec1_att1" label="TCP Ports" title="xxx"/>
<textbox dataattribute="aln2" id="cfw_dial_sec1_att2" label="UDP Ports"/>

</section>
</sectioncol>
</sectionrow>
</section>
<buttongroup id="Order">
<pushbutton id="getcfwdata_12" label="Add to Favorites" mxevent="addtofav" type="link"/>
</buttongroup>
</dialog>

Please help me.
Thanks so much!