Show a message in a label and...

The task described below may take me days but for you it possibly takes only a few minutes. This is why I am coming to you.

There is a label on a webpage id="lblMessage"; upon click on two controls, the following function puts a message in it,

function showMsg(msgNo)
{
var msg1 = 'this is message 1';
var msg2 = 'this is message 2';

if msgNo==1
{
<add to lblMessage msg1 ;>
}
else
{
<add to lblMessage msg2 ;>
}

<the label to show the msg in a bright colored font and gradually die-out using opacity or something else>
Please make the font color and  duration editable.
}

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I am working in asp.net c#

Thank you.