I need some dates

Ha ha, you thought I was a despirate fat man looking for a lover.  

This is pretty easy, I just don't feel like looking this stuff up and implementing it.  So here's bunch of points for a cut and paste answer.

With the following HTML, I need a javascript that will add a week to each date.  For example if I enter in today's date into txtThisDate, it will automatically populate txtID1 to 7/25/02, txtID2 to 8/1/02, txtID3 to 8/8/02 and txtID4 to 8/15/02.  They will be able to change the txtID(n).  I'm assuming the txtThisDate will be an onBlur() command.

Code sample:

self.asp
--------

...
<script language="javascript" src="/include/signup_checkForm.js"></script>
<script language="javascript" src="/include/erythro.js"></script>
...

...
<form method="post" action="self.asp" name="frmE" onSubmit="validateform(frmE)">
<input TYPE="text" SIZE="9" name="txtThisDate" onBlur="isDate(this,'This Date')" value="MM/DD/YYYY">
<input TYPE="text" SIZE="9" onBlur="isDate(this,'1 Injection Date')" name="txtID1">
<input TYPE="text" SIZE="9" onBlur="isDate(this,'2 Injection Date')" name="txtID2">
<input TYPE="text" SIZE="9" onBlur="isDate(this,'3 Injection Date')" name="txtID3">
<input TYPE="text" SIZE="9" onBlur="isDate(this,'4 Injection Date')" name="txtID4">
<input type = submit>
</form>
...

erythro.js
----------

function validateform(form)
{    
     if (form.ThisDate.value == ""){
          alert("Enter a date");
          form.txtName.focus();
     return false
     }    
  form.submit();
}

signup_checkForm.js
-------------------
function chkdate(objName) {
   //all this does is validate the date and change it to a proper format
}