Consider you have 3 Divs & Buttons for displaying message based on your condition
<div id="divMessage1">Message1</div>
<div id="divMessage2">Message2</div>
<div id="divMessage3">Message3</div>
<input type="button" value="Button1" onclick="fnDisplayMessage(1)" />
<input type="button" value="Button2" onclick="fnDisplayMessage(2)" />
<input type="button" value="Button3" onclick="fnDisplayMessage(3)" />
Here javascript for Show/Hide Divs using
if else condition
<script type="text/javascript">
function fnDisplayMessage(MessageID){
if (MessageID == 1){
document.getElementById("divMessage1").style.display="block";
document.getElementById("divMessage2").style.display="none";
document.getElementById("divMessage3").style.display="none";
} else if (MessageID == 2){
document.getElementById("divMessage1").style.display="none";
document.getElementById("divMessage2").style.display="block";
document.getElementById("divMessage3").style.display="none";
} else if (MessageID == 3){
document.getElementById("divMessage1").style.display="none";
document.getElementById("divMessage2").style.display="none";
document.getElementById("divMessage3").style.display="block";
}
</script>
Hope it will help you. BTW next time please include all details completely & code(which you have tried) in your question because it will help you to get solution quickly.