Confirm on delete

<input type="button" onclick="javascript:confirmDelete();" value='Delete'>

<script type="text/javascript">
function confirmDelete() {
var status = confirm("Are you sure you want to delete?");
if(status)
{
 parent.location.replace("parent.location='<?php echo "delete.php?id=" . $people['id'] ?>'");
}
}
</script>