Place this within head

SCRIPT LANGUAGE="JavaScript">

function doit(){

if(window.confirm("Do you want to go to purpleflash...")){

    alert("You're on you way to Purpleflash")

sample.submit();

}else{

    alert("You're not going")

}

}

</SCRIPT>

Place this within body

<li> Click Here to go to Purpleflash.com Calendar Demo

<form name='sample' action=http://www.purpleflash.com/cgi-bin/scheduler/data_show_calendar.p l method='POST'>

<INPUT TYPE=BUTTON VALUE="Go" onClick=doit()>

</form>

NOTE - form name ie sample must be same as sample submit