Alert With Two Options (proceed Or Back To Previous Page)

<script language="JavaScript" type="text/javascript">
if (confirm("Are you sure to delete?"))
{
self.location = 'delete.php'
} else {
history.go(-1);
}
</script>

The above code give an alert with two choices(confirm or cancel).
If the user clicks the cancel button, it will go to previous page.
If the user clicks the confirm button, it will go to delete.php.

I like to make it like the following.
If the user clicks the cancel button, it will go to previous page.
If the user clicks the confirm button, It will proceed reading the next code.(the next code contains the code for deleting.)

I tried to remove "the self.location = 'delete.php'" as a test.

Code:
<script language="JavaScript" type="text/javascript">
if (confirm("Are you sure to delete?"))
{

} else {
history.go(-1);
}
</script>

The above code do;
If the user clicks the cancel button, it will go to previous page.
If the user clicks the confirm button, it will proceed reading the next code. So the deleting will be done.

It seems work fine.

But if the user clicks the cancel button, It will go to prevous page and the deleting will be done.(it might proceed reading the next code)