Hi Raja,
you can give it a shot, when you are writing the multiple select element, on the selected items, you can apply tooltip function, based on mouse hover. I ahve done something in XSL, which might be useful:
my xml file:
<?xml version="1.0" encoding="ISO-8859-1"?>
<?xml-stylesheet type="text/xsl" href="showcountry.xsl"?>
<countries>
<country>Cnt1</country>
<country>Cnt2</country>
<country>Cnt3</country>
<country>Cnt4</country>
<country>Cnt5</country>
<country>Cnt6</country>
</countries>
my xsl file:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl
utput method='html' version='1.0' encoding='UTF-8' indent='yes'/>
<xsl:template match="/">
<html>
<body>
<form name="multiselect">
<table>
<tr>
<td>
<select multiple="true" name="multiTooltip">
<xsl:for-each select="countries/country">
<xsl:element name="option">
<xsl:attribute name="id"><xsl:value-of select="."/></xsl:attribute>
<xsl:attribute name="title"><xsl:value-of select="."/></xsl:attribute>
<xsl:attribute name="value"><xsl:value-of select="."/></xsl:attribute>
<xsl:value-of select="."/>
</xsl:element>
</xsl:for-each>
</select>
</td>
</tr>
</table>
</form>
</body>
</html>
</xsl:template>
</xsl:stylesheet>
-----
you have to place xml and XSL in same folder, and then open the XSL in Browser.