Hello everyone.

I have a form that I have developed and am stuck. The outputs that are displayed should be in 2 decimal places. I have searched for ways to do this, but to no avail have they worked for my piece of code. Please have a look and if you could, suggest a way of making this output work for me as needed.

The form is used to calculate savings and is working as expected (giving me the correct results from the calculated inputs), but only fully after clicking 4 times. I guess this is because the form needs the previous outputs to go ahead with the next calculation, could you also suggest a method that the calculation could loop and complete all calculations with only one click? I'm sure there is a way, I just have no clue how to.

Code

JavaScript
Code:
</script>

<script language="JavaScript">

function showpay() {
 if ((document.calc.a.value == null || document.calc.a.value.length == 0) ||
     (document.calc.b.value == null || document.calc.b.length == 0) ||
     (document.calc.c.value == null || document.calc.c.value.length == 0) ||
     (document.calc.d.value == null || document.calc.d.value.length == 0) ||
     (document.calc.e.value == null || document.calc.e.value.length == 0))
	  
 { alert("Please enter all values");
 }
 else
 {
 var aa = document.calc.a.value;
 var ab = document.calc.b.value;
 var ac = document.calc.c.value;
 var ad = document.calc.d.value;
 var ae = document.calc.e.value;

 var af = document.calc.f.value;
 var ag = document.calc.g.value;
 var ah = document.calc.h.value;
  
 var ai = document.calc.i.value;
 var aj = document.calc.j.value;
 var ak = document.calc.k.value;

 var al = document.calc.l.value;
 var am = document.calc.m.value;
 var an = document.calc.n.value;
 var ao = document.calc.o.value;
 
 var ap = document.calc.p.value;
 var aq = document.calc.q.value;
 var ar = document.calc.r.value;
 var as = document.calc.s.value;
 
 var at = document.calc.t.value;
 var au = document.calc.u.value;
 var av = document.calc.v.value;
 var aw = document.calc.w.value;

// calculations

 document.calc.f.value = ab * ac;
 document.calc.g.value = ac * ad;
 document.calc.h.value = ae / ag;
 
 document.calc.i.value = ah / 4.3;
 document.calc.j.value = ai / 4.3;
 document.calc.k.value = ai / 52;
 
 document.calc.l.value = aa * 1;
 document.calc.m.value = "$" + aa * af;
 document.calc.n.value = ad * af;
 document.calc.o.value = "$" + aa * ag;
 
 document.calc.p.value = aa * 4.3;
 document.calc.q.value = "$" + af * ap; 
 document.calc.r.value = ad * ap;
 document.calc.s.value = "$" + ag * ap;
 
 document.calc.t.value = ap * 12; 
 document.calc.u.value = "$" + af * at;
 document.calc.v.value = ad * at;
 document.calc.w.value = "$" + (ag * at);

 }
}

</script>
HTML Output Excuse the tables please.
Code:
<form name=calc method=POST>
<table class="caltable" width=84% border=0>
<tr>
  <th height="81" colspan="2">&nbsp;</th>
  <td colspan="3"><div align="left">Enter your data in the white fields to work out cost savings <br /> of a Bioptics Specimen Radiography system, or test different scenarios by varying the inputs.</div></td>
  </tr>
<tr><td height="42" colspan="2" align=left><h3>Costs</h3>
<th width=18%>&nbsp;</th>
  <th width=18%></th>
<th width=18%>&nbsp;</th>
</tr>

<tr height="20%"><td height="50" colspan="3" valign="top"><strong>Surgeries Per Week </strong><br>
     How many breast surgeries do you perform?</td>
  <td align=right valign="top"><input type=text name=a size=13></td>
  <td align=right valign="top">&nbsp;</td>
</tr>
<tr>
  <td height="30" colspan="3" valign="top"><strong>Average Minutes Per Surgery </strong></td>
  <td
align=right valign="top"><input type=text name=b size=13></td>
  <td
align=right valign="top">&nbsp;</td>
</tr>
<tr>
  <td height="30" colspan="3" valign="top"><strong>Average Cost Per Surgery </strong></td>
  <td  align=right valign="top"><input name=c type=text size=13></td>
  <td  align=right valign="top">&nbsp;</td>
</tr>
<tr>
  <td height="66" colspan="3" valign="top"><strong>Minutes Saved Per Surgery </strong> <br/ > 
    How many minutes can you save per surgery if you 
don't<br> have to send the specimen out for imaging?</td>
  <td 
align=right valign="top"> <input type=text name=d size=13></td>
  <td 
align=right valign="top">&nbsp;</td>
</tr>
<tr>
  <td height="48" colspan="3" valign="top"><strong>Cost of Digital Equipment</strong> <br/ >
  List price quoted by Bioptics sales representative.</td>
  <td 
  align=right valign="top"> <input name=e type=text size=13></td>
  <td 
  align=right valign="top">&nbsp;</td>
</tr>
<tr>
  <td width="25%" height="35" align=center>&nbsp;</td>
  <td width="21%" height="35" align=center>&nbsp;</td>
  <td height="35" align=center>&nbsp;</td>
  <td height="35" align=center valign="top"><input type="button" onClick='showpay()' value=Calculate>    </td>
  <td height="35" align=center valign="top"><input name="reset" type=reset value=Reset></td>
</tr>
<tr>
  <td height="33" colspan="2" align=left valign="top"><h3>Results</h3></td>
  <td align=right valign="top">&nbsp;</td>
  <td align=right valign="top">&nbsp;</td>
  <td align=right valign="top">&nbsp;</td>
</tr>
<tr>
  <td height="30" colspan="3" valign="top"><strong>Cost of Surgeries</strong> </td>
  <td align=right valign="top"> <input type=text name=f size=13></td>
  <td align=right>&nbsp;</td>
</tr>
<tr>
  <td height="30" colspan="3" valign="top"><strong>Amount saved per surgery</strong> </td>
  <td align=right valign="top"><input type=text name=g size=13></td>
  <td align=right>&nbsp;</td>
</tr>
<tr>
  <td height="30" colspan="3" valign="top"><strong>Surgeries Until Investment is recovered</strong> </td>
  <td align=right valign="top"><input type=text name=h size=13></td>
  <td align=right>&nbsp;</td>
</tr>
<tr>
  <td height="45" colspan="2" rowspan="2" valign="top"><strong>Time Until Investment is recovered</strong></td>
  <td align=right valign="top"><input type=text name=i size=13></td>
  <td align=right valign="top"><input type=text name=j size=13></td>
  <td align=right valign="top"><input type=text name=k size=13></td>
</tr>
<tr>
  <td align=center valign="top">Weeks</td>
  <td align=center valign="top">Months</td>
  <td align=center valign="top">Years</td>
</tr>
<tr>
  <td height="32" colspan="2" align=left><h3>Savings</h3></td>
  <td align=right valign="top">&nbsp;</td>
  <td align=right valign="top">&nbsp;</td>
  <td align=right valign="top">&nbsp;</td>
</tr>
<tr>
  <td height="35" align=center>&nbsp;</td>
  <td height="35" align=center><strong>Total Number<br />of Surgeries</strong></td>
  <td height="35" align=center><strong>Total Cost<br />of Surgeries</strong></td>
  <td height="35" align=center><strong>Total Minutes<br />Saved</strong></td>
  <td height="35" align=center><strong>Total Amount<br />Saved</strong></td>
</tr>
<tr>
  <td width="25%" height="30" valign="top"><strong>Weekly</strong></td>
  <td align=right valign="top"><input type=text name=l size=13></td>
  <td align=right valign="top"><input type=text name=m size=13></td>
  <td align=right valign="top"><input type=text name=n size=13></td>
  <td align=right valign="top"><input type=text name=o size=13></td>
</tr>
<tr>
  <td width="25%" height="30" valign="top"><strong>Monthly</strong></td>
  <td align=right valign="top"><input type=text name=p size=13></td>
  <td align=right valign="top"><input type=text name=q size=13></td>
  <td align=right valign="top"><input type=text name=r size=13></td>
  <td align=right valign="top"><input type=text name=s size=13></td>
</tr>
<tr>
  <td width="25%" height="33" valign="top"><strong>Annually</strong></td>
  <td align=right valign="top"><input type=text name=t size=13></td>
  <td align=right valign="top"><input type=text name=u size=13></td>
  <td align=right valign="top"><input type=text name=v size=13></td>
  <td align=right valign="top"><input type=text name=w size=13></td>
</tr>
<tr>
  <td height="30" align=center>&nbsp;</td>
  <td align=right valign="top">&nbsp;</td>
  <td align=right valign="top">&nbsp;</td>
  <td align=right valign="top">&nbsp;</td>
  <td height="45" align=center valign="top"><img src="images/print_btn_up.png" alt="" name="Pictures" width="100" height="33" align="top"></td>
</tr>
</table>
</form>
Please excuse the table. I have attached an image of the table too, so you have a better idea of how it should be outputted.

Many thanks guys. Cheers,

DS