<style type="text/css">
#dhtmlgoodies_tooltip{
background-color:#EEE;
border:1px solid #000;
position:absolute;
display:none;
z-index:20000;
padding:2px;
font-size:0.9em;
-moz-border-radius:6px;
font-family: "Trebuchet MS", "Lucida Sans Unicode", Arial, sans-serif;
}
#dhtmlgoodies_tooltipShadow{
position:absolute;
background-color:#555;
display:none;
z-index:10000;
opacity:0.7;
filter:alpha(opacity=70);
-khtml-opacity: 0.7;
-moz-opacity: 0.7;
-moz-border-radius:6px;
}
</style>
<script type="text/javascript">
var dhtmlgoodies_tooltip = false;
var dhtmlgoodies_tooltipShadow = false;
var dhtmlgoodies_shadowSize = 4;
var dhtmlgoodies_tooltipMaxWidth = 300;
var dhtmlgoodies_tooltipMinWidth = 100;
var dhtmlgoodies_iframe = false;
var tooltip_is_msie = (navigator.userAgent.indexOf('MSIE')>=0 && navigator.userAgent.indexOf('opera')==-1 && document.all)?true:false;
function showTooltip(e,tooltipTxt)
{
var bodyWidth = Math.max(document.body.clientWidth,document.documentElement.clientWidth) - 20;
if(!dhtmlgoodies_tooltip){
dhtmlgoodies_tooltip = document.createElement('DIV');
dhtmlgoodies_tooltip.id = 'dhtmlgoodies_tooltip';
dhtmlgoodies_tooltipShadow = document.createElement('DIV');
dhtmlgoodies_tooltipShadow.id = 'dhtmlgoodies_tooltipShadow';
document.body.appendChild(dhtmlgoodies_tooltip);
document.body.appendChild(dhtmlgoodies_tooltipShadow);
if(tooltip_is_msie){
dhtmlgoodies_iframe = document.createElement('IFRAME');
dhtmlgoodies_iframe.frameborder='5';
dhtmlgoodies_iframe.style.backgroundColor='#FFFFFF';
dhtmlgoodies_iframe.src = '#';
dhtmlgoodies_iframe.style.zIndex = 100;
dhtmlgoodies_iframe.style.position = 'absolute';
document.body.appendChild(dhtmlgoodies_iframe);
}
}
dhtmlgoodies_tooltip.style.display='block';
dhtmlgoodies_tooltipShadow.style.display='block';
if(tooltip_is_msie)dhtmlgoodies_iframe.style.display='block';
var st = Math.max(document.body.scrollTop,document.documentElement.scrollTop);
if(navigator.userAgent.toLowerCase().indexOf('safari')>=0)st=0;
var leftPos = e.clientX + 10;
dhtmlgoodies_tooltip.style.width = null;
dhtmlgoodies_tooltip.innerHTML = tooltipTxt;
dhtmlgoodies_tooltip.style.left = leftPos + 'px';
dhtmlgoodies_tooltip.style.top = e.clientY + 10 + st + 'px';
dhtmlgoodies_tooltipShadow.style.left = leftPos + dhtmlgoodies_shadowSize + 'px';
dhtmlgoodies_tooltipShadow.style.top = e.clientY + 10 + st + dhtmlgoodies_shadowSize + 'px';
if(dhtmlgoodies_tooltip.offsetWidth>dhtmlgoodies_tooltipMaxWidth){
dhtmlgoodies_tooltip.style.width = dhtmlgoodies_tooltipMaxWidth + 'px';
}
var tooltipWidth = dhtmlgoodies_tooltip.offsetWidth;
if(tooltipWidth<dhtmlgoodies_tooltipminwidth)tooltipwidth>
dhtmlgoodies_tooltip.style.width = tooltipWidth + 'px';
dhtmlgoodies_tooltipShadow.style.width = dhtmlgoodies_tooltip.offsetWidth + 'px';
dhtmlgoodies_tooltipShadow.style.height = dhtmlgoodies_tooltip.offsetHeight + 'px';
if((leftPos + tooltipWidth)>bodyWidth){
dhtmlgoodies_tooltip.style.left = (dhtmlgoodies_tooltipShadow.style.left.replace('px','') - ((leftPos + tooltipWidth)-bodyWidth)) + 'px';
dhtmlgoodies_tooltipShadow.style.left = (dhtmlgoodies_tooltipShadow.style.left.replace('px','') - ((leftPos + tooltipWidth)-bodyWidth) + dhtmlgoodies_shadowSize) + 'px';
}
if(tooltip_is_msie){
dhtmlgoodies_iframe.style.left = dhtmlgoodies_tooltip.style.left;
dhtmlgoodies_iframe.style.top = dhtmlgoodies_tooltip.style.top;
dhtmlgoodies_iframe.style.width = dhtmlgoodies_tooltip.offsetWidth + 'px';
dhtmlgoodies_iframe.style.height = dhtmlgoodies_tooltip.offsetHeight + 'px';
}
}
function hideTooltip()
{
dhtmlgoodies_tooltip.style.display='none';
dhtmlgoodies_tooltipShadow.style.display='none';
if(tooltip_is_msie)dhtmlgoodies_iframe.style.display='none';
}
</SCRIPT>
and In Textbox
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<asp:textbox id="TxtSample" runat="server" xmlns:asp="#unknown">
onmouseout="hideTooltip()"
onmouseover="showTooltip(event,'Put Comments or tool tip hare.');return false" >