Use of the alert command
The box you already see on the screen appeared because
of the following javascript code
<![CDATA[
<script language="JavaScript">
alert("This is an alert-box.You can include any text here.
You have to CLICK to PROCEED ");
</script>
]]>
You may not see this line untill you have clicked "ok".
The presence of a return in the text gave me some trouble.
We can use buttons to make a more controlled use of alert-box as follows.