Please help with this script mod.

I have this script that took forever for me and others here to develop, however I need to modify it.

I need to recalculate totalcost in a differnt maner if tablecount is defined.

here is what the calculation is for the total cost if table count is difined > 0

totalcost = if 1 table =800
if 2 tables = 500
if 3 tables then 700

if the tablecount is defined then all other calculation are nixed with the exceptions of converting the total cost to words which I have also included below.

your help is always greatfully appreciated.


\\performs calculations for form
function CheckForm(){
var today = new Date(today)
var bl = (document.boothinformation.BT_B1_Dim_1.value);
var bw = (document.boothinformation.BT_B1_Dim_2.value);
var columns = (document.boothinformation.BT_Post.value);
var ismember = (document.boothinformation.BT_Member.value);
var corners = (document.boothinformation.BT_Corners.value);
var deposit = (document.boothinformation.BT_Deposit.value);
var contractDate = (document.boothinformation.BT_ContractDate.value);
var compstate = (document.boothinformation.compstate.value);
var country = (document.boothinformation.country.value);
var cancelled = (document.boothinformation.BT_Cancelled.value);
var cancelledDate = (document.boothinformation.BT_CancelledDate.value);
var cdstat = (document.boothinformation.bt_CD_Status.value);
var cddate = (document.boothinformation.BT_cd_Date.value);
var manstat = (document.boothinformation.bt_Manual_Status.value);
var mandate = (document.boothinformation.BT_ManualDate.value);
var fpr = (document.boothinformation.BT_FPR.value);
var fprDate = (document.boothinformation.BT_FPRDate.value);
var DepositDate = (document.boothinformation.BT_DepositDate.value);
<!--- added to support vendors jr 09092004 --->
var Tassign = (document.boothinformation.tableassign.value);
var Tcount = (document.boothinformation.tablecount.value);
<!--- var testdate = (document.boothinformation.OutDate.value); --->
var moy = today.getMonth() + 1;

//does the arithmatic for the total sq ft.
///changed to "must have non zero value" (not a NAN either)
if((bl >0) && (bw >0) || columns>0){
     var columnsqft = (columns * 5);
   if(bl<1 || bw<1)
     {  var totalsqft = (document.boothinformation.BT_TotalSQFT.value - (columnsqft));
    }
    else     {
var totalsqft = ((bl*bw) - (columnsqft));    
}
     document.boothinformation.BT_TotalSQFT.value = totalsqft;
      }
   
      
//calculates member and non member cost
totalsqft=document.boothinformation.BT_TotalSQFT.value
     if (ismember == 1){
          var totalcost = ((totalsqft * 10) + (corners * 200));
          var memdiscount = (totalsqft);
     }
      if (ismember == 0)       {
          var totalcost = ((totalsqft * 11) + (corners * 200));
          var memdiscount = (0);
     }
     
      
     document.boothinformation.BT_TotalCost.value = totalcost;
     document.boothinformation.BT_MemberD.value = memdiscount;
if (compstate == 'NA')
{
 document.boothinformation.BT_TotalCost.value = totalcost;
    }
if (compstate != 'NA')
{
 document.boothinformation.BT_TotalCost.value = (0);
 }
      
        
            <!--- calculate all with under the month of august the country =usa --->
if ((totalsqft >= 301))
        {
document.boothinformation.BT_FPR.value = (0);
document.boothinformation.BT_FPRDate.value = ('');
                   document.boothinformation.BT_Deposit.value = ((totalcost) * .25);
document.boothinformation.BT_DepositDate.value = (setNewDate(document.boothinformation.BT_ContractDate.value));
     }
      
      
        if ((totalsqft <= 300 ))
{
document.boothinformation.BT_FPR.value = (1);
document.boothinformation.BT_FPRDate.value = (setNewDate(document.boothinformation.BT_ContractDate.value));

document.boothinformation.BT_Deposit.value = (0);
document.boothinformation.BT_DepositDate.value = ('');
     }
      

      
       if  (moy>=9)
       {
document.boothinformation.BT_FPR.value = (1);
document.boothinformation.BT_FPRDate.value = (setNewDate(document.boothinformation.BT_ContractDate.value));
document.boothinformation.BT_Deposit.value = (0);
document.boothinformation.BT_DepositDate.value = ('');
     }
      
 if (((country != 'USA') ) && ((country != 'Canada')))
       {
document.boothinformation.BT_FPR.value = (1);
document.boothinformation.BT_FPRDate.value = (setNewDate(document.boothinformation.BT_ContractDate.value));
document.boothinformation.BT_Deposit.value = (0);
document.boothinformation.BT_DepositDate.value = ('');
     }
      
      
}



-->
</SCRIPT>